An adverb is the word that tells you how, when, where, or to what degree something happens — quickly, now, here, very. Icelandic adverbs come in two broad kinds: a small army of dedicated, underived words you simply learn (núna 'now', hér 'here', oft 'often'), and a large, productive class derived from adjectives that gives you a new adverb for free every time you learn a new adjective. This page maps the whole system so you can see how the pieces fit; each type then gets its own page for the details. The single most useful thing to take away is the derivation shortcut: in Icelandic, the manner adverb is almost always identical to the neuter form of the adjective, so the moment you know kalt ('cold', neuter) you already know how to say 'coldly'.
Two ways adverbs are built
Icelandic adverbs split cleanly by origin. Knowing which group a word belongs to tells you whether you can predict its form or simply have to memorise it.
Underived adverbs are standalone words with no adjective behind them. These are the high-frequency closed classes: place (hér, þar, úti, inni), time (núna, þá, bráðum), frequency (oft, alltaf, aldrei), and degree (mjög, frekar, alveg). You learn them as vocabulary, the way you learn here and often in English.
Derived adverbs are built from adjectives and answer 'how?' (manner). This is the open, productive class: every new descriptive adjective hands you a manner adverb.
Hér er kalt.
It's cold here. — hér is an underived place adverb you just learn.
Hann talar alltaf hratt.
He always talks fast. — alltaf is an underived frequency adverb; hratt is derived from the adjective hraður 'fast'.
The derivation shortcut: adverb = neuter adjective
Here is the rule that does most of the work. To turn a Icelandic adjective into a manner adverb, you usually take its strong neuter singular form — the -t form — and use it unchanged. English adds -ly; Icelandic mostly does nothing at all, because the neuter adjective already is the adverb.
| Adjective (masc.) | Neuter (-t form) | = Manner adverb | Meaning |
|---|---|---|---|
| hraður | hratt | hratt | fast / quickly |
| fljótur | fljótt | fljótt | quick / quickly |
| hægur | hægt | hægt | slow / slowly |
| fallegur | fallegt | (fallega) | beautiful → beautifully |
Bíllinn er fljótur.
The car is fast. — fljótur is the adjective agreeing with the masculine noun bíll.
Hann keyrir fljótt.
He drives quickly. — the same word in neuter form, fljótt, now works as the adverb.
A second productive pattern uses the suffix -lega, the closest thing Icelandic has to English -ly. It is especially common with longer, more abstract adjectives: eðlilegur → eðlilega ('naturally'), venjulegur → venjulega ('usually'), greinilegur → greinilega ('clearly'). Manner adverbs and their formation get a full treatment on the manner adverbs page.
Hún útskýrði þetta greinilega.
She explained this clearly. — greinilega, the -lega adverb from greinilegur.
The irregular high-frequency ones
The catch is that the most common adverbs of all are irregular — and that is exactly why they are common. 'Well' and 'badly' are not built from the neuters of góður ('good') and vondur ('bad'); they are suppletive forms you simply memorise: vel ('well') and illa ('badly'). Likewise 'very' is mjög, which is not derived from anything.
Hún syngur mjög vel.
She sings very well. — vel is the suppletive adverb for 'well', not a -t form of góður.
Mér gekk illa í prófinu.
I did badly on the test. — illa is the suppletive adverb 'badly', ending in -a, not -t.
So the practical division is: a handful of frequent, irregular manner adverbs (vel, illa) that you drill by heart, and a huge regular class (hratt, fallega, varlega) that you generate on the fly from adjectives.
Time, place, degree: the underived families
Beyond manner, the other adverb families are mostly underived words. You do not build them; you collect them.
Time — when something happens: núna ('now'), þá ('then'), bráðum ('soon'), seinna ('later'), enn ('still'). See adverbs of time.
Ég ætla að hringja í þig seinna.
I'll call you later. — seinna 'later', an underived time adverb.
Frequency — how often: alltaf ('always'), oft ('often'), stundum ('sometimes'), sjaldan ('rarely'), aldrei ('never'). See adverbs of time and frequency.
Við förum oft í sund á sunnudögum.
We often go swimming on Sundays. — oft 'often'.
Degree — how much: mjög ('very'), frekar ('rather'), alveg ('completely'), alltof ('too / far too'). These modify adjectives and other adverbs.
Þetta er alveg satt.
That's completely true. — alveg 'completely', a degree adverb modifying the adjective satt.
The directional system: a three-way contrast
Place adverbs in Icelandic carry one feature English lacks: they distinguish location from motion toward from motion from — a three-way triad where English uses a single word. Here in English covers hér (be here), hingað (to here), and héðan (from here).
| Location (where?) | Toward (whither?) | From (whence?) |
|---|---|---|
| hér (here) | hingað (to here) | héðan (from here) |
| þar (there) | þangað (to there) | þaðan (from there) |
| heima (at home) | heim (homeward) | heiman (from home) |
Ég bý hér en ég ætla að flytja þangað.
I live here but I'm going to move there. — hér (location) vs þangað (motion toward).
This is the single most error-prone area of the Icelandic adverb system for English speakers, and it has its own dedicated page on the directional triads. For now, just register that hér and hingað are not interchangeable.
Placement, in one sentence
Word order is covered fully under syntax, but the rule of thumb is simple: an adverb normally comes right after the finite (conjugated) verb in a main clause.
Ég fer alltaf snemma að sofa.
I always go to bed early. — alltaf sits right after the finite verb fer.
Because Icelandic is a verb-second (V2) language, fronting an adverb pushes the subject after the verb: Stundum fer ég snemma að sofa ('Sometimes I go to bed early'), with fer before ég. That inversion is detailed on the frequency page.
Common Mistakes
❌ Hann talar hraðlega.
Incorrect — there is no '-ly' suffix to bolt on here; the adverb is just the neuter adjective.
✅ Hann talar hratt.
He talks fast.
❌ Hún syngur mikið vel.
Incorrect — 'very' is mjög, not mikið; mikið means 'a lot / much'.
✅ Hún syngur mjög vel.
She sings very well.
❌ Mér gekk vont í prófinu.
Incorrect — 'badly' is the suppletive adverb illa, not the neuter adjective vont.
✅ Mér gekk illa í prófinu.
I did badly on the test.
❌ Komdu hér!
Incorrect — 'come' is motion toward, so it needs the directional form hingað.
✅ Komdu hingað!
Come here!
Key Takeaways
- Icelandic adverbs are either underived (learn them: hér, núna, oft, mjög) or derived from adjectives (generate them).
- The derivation shortcut: a manner adverb is usually the neuter (-t) form of the adjective — hraður → hratt. No -ly suffix needed.
- A second productive pattern is -lega (greinilega, venjulega), for longer, more abstract adjectives.
- The most common manner adverbs are irregular: vel ('well'), illa ('badly'), and mjög ('very') are memorised, not built.
- Place adverbs run in three-way directional triads (hér / hingað / héðan), unlike English's single here.
- Default placement: an adverb sits right after the finite verb; fronting it triggers V2 inversion.
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- Manner Adverbs and How to Form ThemA2 — Manner adverbs answer 'how?' — vel, illa, hægt, hratt, varlega, greinilega. The high-frequency ones are irregular (vel, illa) and memorised; the rest are derived from the neuter adjective or with -lega and generated freely.