How Greek Adjectives Work

In English an adjective is the one part of speech that never moves. Good is good in a good man, a good woman, good children and the coffee is good — one shape, always. Greek adjectives are the opposite: a single adjective has dozens of forms, because it must agree with its noun in gender, case and number, and it declines with almost the same endings as the nouns you have already met. This page is the map of the whole system — how agreement works, the one pattern that covers most adjectives, and where the rest of the section takes each piece.

An adjective agrees with its noun three ways at once

Every time you attach an adjective to a noun, you copy three of the noun's properties onto it:

• its gender (masculine, feminine or neuter),
• its case (nominative, genitive, accusative or vocative — the job it is doing in the sentence),
• its number (singular or plural).

Take the commonest adjective in the language, καλός ("good"), and put it in front of a noun of each gender:

One English word, good, becomes three Greek words — καλός, καλή, καλό — chosen to match the gender of the noun. This three-way split -ος / -η / -ο is the single most important adjective ending in Greek, and you will meet it on thousands of words.

The adjective sits inside the article

Notice where the adjective goes: between the article and the noun, exactly where English puts it — the good man, ο καλός άντρας. This is the default, and it is called the attributive position. When the phrase changes case, the adjective changes with the article and the noun, all together:

There is a second position too. Put the adjective after the verb είμαι ("to be") and it describes the subject from a distance — the coffee is good, ο καφές είναι καλός. This is the predicative position, and the adjective still agrees, this time with the subject.

The mechanics of copying gender, case and number onto the adjective — attributive and predicative, all four cases, both numbers — are the subject of the next page, adjective agreement. Because agreement runs across the whole noun phrase (article + adjective + noun moving as one block), it also overlaps with case agreement within the noun phrase: that page owns the phrase as a unit; the adjective pages own the adjective's own forms.

The dominant pattern: -ος / -η / -ο

Most Greek adjectives belong to the -ος / -η / -ο class, and its endings are the ones you already know from the nouns. The masculine declines like a masculine -ος noun (ο δρόμος), the feminine like a feminine -η noun (η αγάπη), the neuter like a neuter -ο noun (το βουνό):

The full grid — every case, both numbers, all three genders, plus the vocative — is on adjectives in -ος / -η / -ο. Master that one paradigm first: it is the model everything else is measured against, and it alone covers a large fraction of the adjectives you will ever use — μικρός (small), μεγάλος (big), ψηλός (tall), όμορφος (beautiful), ακριβός (expensive), φθηνός (cheap), ζεστός (warm), κρύος... almost.

The smaller classes

Not every adjective ends in -ος / -η / -ο, and the exceptions are common enough that you meet them in your first month. Each has its own short page:

• -ος / -α / -ο — the same as the main class but with a feminine in -α instead of -η, used when a vowel comes before the ending: νέος / νέα / νέο (new, young), ωραίος / ωραία / ωραίο (nice), παλιός / παλιά / παλιό (old). See adjectives in -ος / -α / -ο.
• -ύς / -ιά / -ύ — a smaller but very frequent group: βαθύς / βαθιά / βαθύ (deep), φαρδύς (wide), μακρύς (long). See adjectives in -ύς / -ιά / -ύ.
• -ης / -ης / -ες — a two-termination type where masculine and feminine share one form: διεθνής (international), ακριβής (precise), συνεχής (continuous). See two-termination adjectives in -ης / -ης / -ες.
• -ων / -ουσα / -ον — present-participle adjectives inherited from the older language: ενδιαφέρων (interesting). See participial adjectives in -ων / -ουσα / -ον.
• πολύς (much, many) is genuinely irregular and gets its own page.
• Some adjectives do not decline at all — borrowed colours and loanwords like μπλε (blue), ροζ (pink), γκρι (grey), μοβ (purple). These sit unchanged in front of any noun: see indeclinable adjectives.

Comparison: bigger, biggest

Once an adjective agrees, you also need to make it stronger — good, better, best. Greek has two ways to say "more":

• the analytic πιο + adjective (πιο καλός, "more good" = better) — the everyday default;
• the synthetic ending -τερος (καλύτερος), which for καλός happens to be irregular.

The superlative ("the best") simply puts the article in front of the comparative: ο καλύτερος, ο πιο μεγάλος. All of this — the two comparatives, the two superlatives, the irregular forms and what case the thing you compare to takes — lives in the Comparison pages, starting with the comparative with πιο.

Why this is harder than it looks — and why it is worth it

Be honest about the difficulty. The vocabulary is easy: big, good, tired are simple words. The work is that you can never leave an adjective in its dictionary form. Every single time you use one, you have to look at the noun, read off its gender, case and number, and rebuild the adjective's ending to match — in real time, while you are talking. English speakers are not used to thinking about the adjective at all, so this is the reflex that takes the longest to build.

The pay-off is the same one the whole case system buys you: because the adjective carries the grammar, Greek can move it around, separate it from its noun, or drop the noun entirely and let the adjective stand in for it (ο μικρός = "the little one"). An adjective that agrees is an adjective that can go anywhere.

Common Mistakes

1. Leaving the adjective in its masculine dictionary form. The commonest beginner error — the adjective must match the noun's gender.

2. Matching gender but forgetting the case. Here the noun phrase is an object, so the adjective must go accusative too.

3. Not agreeing in the predicative position. After είμαι the adjective still matches the subject.

4. Giving a neuter plural noun a masculine adjective. Neuter plurals end in -α, and everyday objects (shoes, glasses, books) are neuter.

Where to go next

Basics

Declension classes

Using adjectives

Comparison

Detail and special sets

Key Takeaways

• A Greek adjective agrees with its noun in gender, case and number and declines with noun-like endings — where English keeps the adjective frozen.
• The dominant class is -ος / -η / -ο (καλός / καλή / καλό); learn its full paradigm first.
• Adjectives sit inside the article (attributive: ο καλός άντρας) or after είμαι (predicative: ο καφές είναι καλός) — and agree in both positions.
• Smaller classes: -ος/-α/-ο (νέος), -ύς/-ιά/-ύ (βαθύς), -ης/-ης/-ες (διεθνής), -ων/-ουσα/-ον (ενδιαφέρων), irregular πολύς, and indeclinable colours (μπλε, γκρι).
• Comparison is πιο + adjective or the ending -τερος; the superlative adds the article.
• The real skill is a reflex: never leave an adjective in its dictionary form — rebuild its ending to match its noun every single time.