Synonyms for fast

adjective

• unwavering in devotion to friend or vow or cause
• securely fixed in place
• hurried and brief
• unrestrained by convention or morality
• acting or moving or capable of acting or moving quickly
• at a rapid tempo
• (of a photographic lens or emulsion) causing a shortening of exposure time
• (of surfaces) conducive to rapid speeds
• resistant to destruction or fading

adverb

• firmly or closely

noun

• abstaining from food

verb

• abstain from certain foods, as for religious or medical reasons
• abstain from eating

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