fast

a period of fasting that continues for an extended time

to a high degree of speed

to a very high degree of speed

so fast it is difficult to believe

faster than expected

fast to a degree that causes surprise or wonder

unusually fast; much faster than normal

fast in a way that is surprising or worthy of comment

slightly faster than desired or normal

moderately or quite fast

a small amount faster than desired or normal

fast in comparison to something else

so fast that it is unsafe or poses a risk

fast to a satisfying or acceptable degree

very or extremely fast (informal)

so fast it is difficult to perceive clearly

extremely and impressively fast

used to describe someone or something's speed

used to describe the perceived speed of something

to end a period of fasting by eating

to start a period of fasting

to observe a period of fasting

to formally follow the practice of fasting