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English definition of “fast”

fast

adverb, adjective     /fɑːst/ US  /fæst/
C2 firmly fixed : The glue had set and my hand was stuck fast. He tried to get away, but she held him fast.Tight and tightening Grammar:Fast, quick or quickly?Fast and quick mean moving with great speed. Fast is both an adjective and an adverb. Quick is an adjective and the adverb form is quickly.
(Definition of fast adverbadjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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