adjective

fast

fast, quick, rapid, quickly

He is a very fast runner.

He is a very fast runner.

She can run very fast.

She can run very fast.

My watch is five minutes fast.

My watch is five minutes fast.

((fast + noun)) moving or capable of moving at high speed. He is a very fast runner.

((verb + fast)) at high speed. She can run very fast.

((sth. is fast)) (of a clock) showing a time ahead of the correct time. My watch is five minutes fast.

Synonyms: quick, rapid, swift; Antonyms: slow

From Old English 'fæst' meaning 'firm, fixed'. The sense of 'rapid' developed from the idea of 'strong, vigorous'.

'Fast' is both an adjective (a fast car) and an adverb (drive fast). Remember, 'fastly' is not a word.

This page is designed for learning support. Please use it as a learning reference, not as a formal reference.