Common adverbs

Two suffix families turn adjectives into adverbs. There’s no crisp rule for which adjective takes which — the pairings are absorbed word by word from input.

-l / -ul / -ül

• jó → jól (well)
• rossz → rosszul (badly)
• remek → remekül (superbly)
• makacs → makacsul (stubbornly)
• egyedül (alone)

This family also names the language you speak — which is why this site is called what it is:

• magyar → magyarul (lit. Hungarianly)
• angol → angolul · német → németül · finn → finnül

Beszélsz magyarul? — literally do you speak Hungarianly?

-n / -an / -en / -on

Vowel harmony picks the linker: front vowels → -en, back → -an/-on, vowel-final → -n:

• gyors → gyorsan (quickly)
• szép → szépen (beautifully, nicely)
• csendes → csendesen (silently)
• nagy → nagyon (very)
• ritka → ritkán (rarely)
• gyakran (frequently — from the now-unused adjective gyakor)

Same adjective, both endings

A few adjectives take either suffix with a meaning split — piszkos (dirty):

• piszkosul — like crazy (intensifier, figurative)
• piszkosan — dirtily (literally, physically dirty)

The figurative/literal split is a recurring pattern worth noticing when both forms exist.