fast
Unwavering in devotion to friend or vow or cause.
“fast friends”
At a rapid tempo.
“the band played a fast fox trot”
(of a photographic lens or emulsion) causing a shortening of exposure time.
“a fast lens”
(of surfaces) conducive to rapid speeds.
“a fast road”
“grass courts are faster than clay”
Resistant to destruction or fading.
“fast colors”
Securely fixed in place.
Hurried and brief.
“a fast visit”
Unrestrained by convention or morality.
“fast women”
Acting or moving or capable of acting or moving quickly.
“fast film”
“on the fast track in school”
(used of timepieces) indicating a time ahead of or later than the correct time.
“my watch is fast”
Firmly or closely.
“held fast to the rope”
“her foot was stuck fast”
Abstaining from food.
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”