Esperanto forms ordinary comparatives analytically: put pli before a gradable expression for a higher degree and malpli before it for a lower degree. La nova vojo estas pli mallonga ol la malnova means that the new road has a greater degree of shortness; malpli trafikata means that it has a lower degree of traffic. The comparison particles never change their form.
The core pattern: pli/malpli + quality + ol
With an adjective, pli or malpli changes the degree, while ol introduces the standard being compared:
Ĉi tiu ĉambro estas pli hela ol la alia.
This room is brighter than the other one.
La marda trajno estas malpli multekosta ol la lunda.
Tuesday's train is less expensive than Monday's.
There is no irregular comparative ending corresponding to English “-er,” and common adjectives do not acquire special comparative stems. “Better” is simply pli bona, “worse” pli malbona, and “younger” pli juna:
La dua propono estas pli bona, sed ĝi ankaŭ estas pli multekosta.
The second proposal is better, but it is also more expensive.
Pli and malpli are particles, not adjectives. They receive no -a, -j, or -n. The adjective still agrees normally with its noun:
Ni elektis la pli trankvilajn ĉambrojn.
We chose the quieter rooms.
Mi mendis la malpli dolĉan deserton.
I ordered the less sweet dessert.
The endings on trankvilajn and dolĉan express the adjective's number and case. They have nothing to do with comparative degree.
Comparative degree versus a superlative extreme
Pli and malpli compare one degree with a standard, normally introduced by ol. Plej and malplej instead select the highest or lowest degree within a set, which can be introduced by el:
La arbara itinero estas pli mallonga ol la marborda.
The forest route is shorter than the coastal route.
La arbara itinero estas la plej mallonga el la kvar proponitaj itineroj.
The forest route is the shortest of the four proposed routes.
The first sentence compares two lengths; the second selects one extreme from four members. Likewise, malpli multekosta ol la alia compares costs, whereas la malplej multekosta el la kvar identifies the bottom of that cost scale. The next page develops superlatives with plej and malplej in full.
Comparisons of manner and action
The same particles modify adverbs, so comparison is not limited to properties of nouns:
Bonvolu paroli pli malrapide; la sono interrompiĝas.
Please speak more slowly; the sound keeps cutting out.
Post la ĝisdatigo la programo funkcias malpli stabile ol antaŭe.
After the update, the program works less reliably than before.
An adverb has no agreement endings. Pli rapide can describe how one person runs, how several machines operate, or how an object was moved.
Pli may also modify a verb or larger predicate, though pli multe can make a quantity-of-action reading explicit:
Mi nun ripozas pli kaj laboras malpli.
I now rest more and work less.
Ĉu vi vojaĝas pli multe ol antaŭ la pandemio?
Do you travel more than before the pandemic?
Placement matters because it helps show scope. Mi pli ŝatas teon ol kafon means that tea ranks higher in my liking than coffee. Mi ŝatas pli fortan teon means that the tea itself should be stronger.
What ol actually connects
Ol introduces the comparison standard. What follows is often a shortened clause, and its form depends on the role it would have in the complete thought:
Mia fratino konas ŝin pli bone ol mi.
My sister knows her better than I do.
Here mi is the understood subject of konas ŝin. Compare:
Mia fratino konas ŝin pli bone ol min.
My sister knows her better than she knows me.
Now min is the understood object of konas. Ol does not govern nominative or accusative case. The expanded meaning does. When the short version could be misread, repeat enough of the clause:
Mia fratino konas ŝin pli bone ol mi konas ŝin.
My sister knows her better than I know her.
This principle is covered in depth on the comparison particle ol.
Inequality versus equality
Use pli ... ol or malpli ... ol when two degrees differ. Equality uses tiel ... kiel or same ... kiel, not ol:
La dua vojo estas tiel longa kiel la unua.
The second route is as long as the first.
La dua vojo estas pli longa ol la unua.
The second route is longer than the first.
This is a form-meaning contrast. Kiel presents a matching standard; ol presents the standard that the higher or lower degree exceeds. English “than” versus “as” offers a useful parallel, but Esperanto retains kiel consistently in equality patterns.
Negative equality does not automatically equal a positive malpli comparison in every discourse context, although their factual implications often overlap:
La nova modelo ne estas tiel peza kiel la malnova.
The new model is not as heavy as the old one.
This tactfully denies equality. La nova modelo estas malpli peza directly places it lower on the heaviness scale. The first is often preferred when correcting an expectation; the second directly ranks two items.
English “more”: degree, quantity, or additional?
English uses “more” for several structures that Esperanto keeps separate. Before translating, decide what is increasing.
For a higher degree of a quality or manner, use pli directly:
Ni bezonas pli klaran klarigon.
We need a clearer explanation.
For a larger quantity of an uncounted noun, use pli da:
Ni bezonas pli da tempo por kontroli la datumojn.
We need more time to check the data.
With a counted plural, pli multaj makes the quantity explicit:
Ĉi-jare partoprenis pli multaj lernejoj ol pasintjare.
More schools participated this year than last year.
When the noun is understood, pli can stand alone:
— Ĉu sufiĉas dek minutoj? — Ne, ni bezonas pli.
— Are ten minutes enough? — No, we need more.
Finally, plia means “additional” or “another,” not simply a greater degree:
La teamo petis plian semajnon por fini la laboron.
The team asked for an additional week to finish the work.
Pli longa semajno would be a week of greater length; plia semajno adds one more week. See quantity comparison for count and amount patterns.
Malpli X is not always pli mal-X
Esperanto's productive mal- creates an opposite, while malpli lowers a degree. These operations can lead to different meanings:
La griza jako estas malpli bela ol la blua.
The gray jacket is less beautiful than the blue one.
La griza jako estas pli malbela ol la blua.
The gray jacket is uglier than the blue one.
Malpli bela need not call the gray jacket ugly; it merely ranks it lower in beauty. Pli malbela explicitly increases ugliness. On a scale with a neutral middle, those are not identical claims. The same contrast appears in malpli feliĉa “less happy” versus pli malfeliĉa “more unhappy.”
Degree modifiers and contextual standards
Words such as multe, iom, and ankoraŭ can refine a comparative:
La riparo estis multe pli simpla ol ni atendis.
The repair was much simpler than we expected.
Ĉu vi povas fari la titolon iom malpli granda?
Can you make the title a little smaller?
La nova versio estas ankoraŭ pli rapida.
The new version is even faster.
The comparison standard need not always be stated. La nova versio estas pli rapida is complete when context supplies “than the old one” or “than before.” Omitting ol is not vague if both speakers know the baseline; in a new or technical comparison, name it.
Productive pli + adjective/adverb is neutral in every register. Literary or specialized vocabulary may offer lexical alternatives, but a rare word is not inherently more correct than the transparent comparative.
Common Mistakes
Inflecting the particle
❌ Ni rezervis la pliajn komfortajn sidlokojn.
Incorrect for ‘the more comfortable seats’ — pliaj means additional.
✅ Ni rezervis la pli komfortajn sidlokojn.
We reserved the more comfortable seats.
Using ol after equality
❌ La dua ĉambro estas tiel hela ol la unua.
Incorrect — equality takes kiel.
✅ La dua ĉambro estas tiel hela kiel la unua.
The second room is as bright as the first.
Treating every English “more” as direct pli + noun
❌ Ni bezonas pli tempo por la laboro.
Incorrect — an uncounted noun quantity normally uses pli da.
✅ Ni bezonas pli da tempo por la laboro.
We need more time for the work.
Confusing lower positivity with stronger negativity
❌ La respondo estas pli malklara.
Wrong if you only mean less clear; this says more unclear.
✅ La respondo estas malpli klara.
The answer is less clear.
Letting English word order hide the scope
❌ Mi volas pli kafon fortan.
Unnatural and unclear — degree and quantity are not packaged this way.
✅ Mi volas pli fortan kafon.
I want stronger coffee.
Key Takeaways
Use invariant pli and malpli before an adjective, adverb, verb, or other gradable expression. Introduce an unequal comparison standard with ol, but use kiel for equality. Keep adjective agreement on the adjective, reconstruct omitted material to choose case after ol, and decide whether English “more” means greater degree, greater quantity, or an additional item before choosing pli, pli da, pli multaj, or plia.
Related Topics
- The Comparison Particle OlB1 — Use the invariant particle ol to introduce standards of unequal comparison, with the correct case, preposition, and clause structure.
- Equality with Tiel… Kiel…B1 — Express equal degree and manner with tiel… kiel…, distinguish equality from inequality and quantity, and control ellipsis and scope.
- Quantity ComparisonB2 — Compare amounts and counts with pli da, pli multaj, tiom… kiom…, and numerical thresholds while keeping degree and addition distinct.
- Degree Modifiers with ComparativesB2 — Refine Esperanto comparatives by stating the size, progression, emphasis, or exact measure of the difference.
- Lexical Comparatives and ElativesC1 — Distinguish productive pli and plej comparisons from words that encode ranking, preference, endpoints, or an exceptionally high degree.
- Adjectives and DegreeA2 — How invariant degree words strengthen, weaken, limit, negate, and compare the properties expressed by Esperanto adjectives.