1. [ adjective ] 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"

Related terms: slow rapid quick fleet hurrying high-speed rapid high-speed accelerating instantaneous accelerated high-speed blistering immediate meteoric hastening speeding fast-breaking hot winged alacritous fast-paced express double-quick jet-propelled sudden hurried expedited speed
2. [ adverb ] 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" "fast-breaking news" "fast-opening (or fast-closing) shutters"

3. [ adverb ] firmly or tightly
Synonyms: tight

"held fast to the rope" "her foot was stuck fast" "held tight"

4. [ noun ] (food) abstaining from food
Synonyms: fasting
Related terms: abstinence ramadan diet hunger_strike
5. [ adjective ] (used of timepieces) indicating a time ahead of or later than the correct time

"my watch is fast"

Related terms: slow
6. [ adjective ] hurried and brief
Synonyms: quick flying

"paid a flying visit" "took a flying glance at the book" "a quick inspection" "a fast visit"

Related terms: hurried
7. [ adjective ] unwavering in devotion to friend or vow or cause
Synonyms: loyal truehearted firm

"a firm ally" "loyal supporters" "the true-hearted soldier...of Tippecanoe"- Campaign song for William Henry Harrison "fast friends"

Related terms: faithful
8. [ adjective ] securely fixed in place
Synonyms: immobile firm

"the post was still firm after being hit by the car"

Related terms: fixed
9. [ adjective ] unrestrained by convention or morality
Synonyms: degenerate degraded dissipated dissolute libertine profligate riotous debauched

"Congreve draws a debauched aristocratic society" "deplorably dissipated and degraded" "riotous living" "fast women"

Related terms: immoral
10. [ adjective ] (used of persons) dependable in devotion or allegiance or affection
Synonyms: true loyal faithful

"a faithful old dog" "a faithful friend" "fast friends" "a loyal companion" "she proved a true friend" "a lover absolutely true in act and word and thought"- H.O.Taylor

Related terms: constant
11. [ adjective ] permanently dyed
Synonyms: colorfast

"fast colors" "colorfast fabrics"

Related terms: impervious dyed
12. [ adjective ] (of surfaces) conducive to rapid speeds

"a fast road" "grass courts are faster than clay"

Related terms: smooth
13. [ adjective ] firmly fastened or secured against opening
Synonyms: locked secured latched bolted barred

"windows and doors were all fast" "a locked closet" "left the house properly secured"

Related terms: fastened
14. [ adjective ] (music) at a rapid tempo

"the band played a fast fox trot"

Related terms: slow music presto prestissimo allegretto vivace andantino allegro
15. [ verb ] (food) abstain from certain foods, as for religious or medical reasons

"Catholics sometimes fast during Lent"

Related terms: abstain diet
16. [ adjective ] resistant to destruction or fading

"fast colors"

Related terms: impervious
17. [ noun ] Last name, frequency rank in the U.S. is 6550
18. [ verb ] abstain from eating

"Before the medical exam, you must fast"

Related terms: abstain diet
Similar spelling:   Faust