adjective
fast
A1
schnell: adjective and adverb meaning 'fast' or 'quick'. Gradable: comparative schneller, superlative am schnellsten. Antonym: langsam. Used attributively with endings and predicatively without. As adverb it stays unchanged (Er fährt schnell). Not a strong/irregular adjective; regular comparative/superlative formation. Also used to describe services, e.g. fast train.
Examples
Der Zug fuhr sehr schnell, obwohl das Wetter schlecht war.
The train went very fast, although the weather was bad.
Der Zug ist sehr schnell.
The train is very fast.
Details
Mnemonics
Picture a racer with an 'S' cape zooming fast
like English 'snail' but think the opposite — a 'fast' snail is silly
Notes
Can be used attributively (ein schneller Wagen) or predicatively (der Wagen ist schnell).