fast

acting or moving or capable of acting or moving quickly

“fast film”

“on the fast track in school”

“set a fast pace”

“a fast car”

(used of timepieces) indicating a time ahead of or later than the correct time

“my watch is fast”

at a rapid tempo

“the band played a fast fox trot”

(of surfaces) conducive to rapid speeds

“a fast road”

“grass courts are faster than clay”

resistant to destruction or fading

“fast colors”

unrestrained by convention or morality

“Congreve draws a debauched aristocratic society”

“deplorably dissipated and degraded”

“riotous living”

“fast women”

abstaining from food

quickly or rapidly (often used as a combining form)

“how fast can he get here?”

“ran as fast as he could”

“needs medical help fast”

“fast-running rivers”

firmly or closely

“held fast to the rope”

“her foot was stuck fast”

“held tight”

abstain from certain foods, as for religious or medical reasons

“Catholics sometimes fast during Lent”

abstain from eating

“Before the medical exam, you must fast”