4
closely
4
deep-rooted(adjective, calm, strong, solid, steady)
4
dependable(adjective, close, strong, tough, correct)
4
famish(verb, refrain)
4
feast(noun, rite, regularity of recurrence periodicity)
4
flat-out(adverb, immediately, quickly, rapidly, hastily)
4
full tilt(expression, idiom, adverb, quickly, rapidly)
4
immovably
4
immutable(adjective, calm, strong, solid, fixed)
4
in a flash(expression, idiom, adverb, quickly, rapidly)
4
in a hurry(expression, idiom, adverb, quickly, rapidly)
4
in nothing flat(expression, adjective, idiom, adverb, brisk)
4
in short order(expression, idiom, adverb, early, quickly)
4
incontinent(adjective, restraint, loose, vulgar, immoral)
4
indelible(adjective, continue, firm, constant, steadfast)
4
intimate(adjective, close, friendly, warm, near)
4
jammed
4
keen(adjective, smart, bright, energetic, active)
4
lecherous(adjective, open, light, informal, loose)
4
like a flash(expression, idiom, adverb, quickly, rapidly)
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APASmart Define. (2016). fast thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fast/thesaurus/synonyms
ChicagoSmart Define. 2016. "fast thesaurus" https://smartdefine.org/fast/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, fast thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fast/thesaurus/synonyms>.
MLASmart Define. "fast thesaurus" 1 April 2016. Web. 23 September 2026. <https://smartdefine.org/fast/thesaurus/synonyms>