11
soften(verb, calm, drop, control, order)
10
curb(verb, drop, control, cut, decline)
10
drop(verb, stop, cut, decline, reduce)
9
check(verb, hold, calm, drop, control)
8
decline(verb, stop, drop, control, dull)
8
fall(verb, stop, calm, control, quiet)
8
fall off(verb, expression, phrasal verb, drop, cut)
8
let go(verb, expression, idiom, stop, calm)
8
loose(verb, calm, quiet, remove, reduce)
8
relent(verb, calm, control, quiet, go)
8
relieve(verb, calm, control, quiet, help)
8
slack off(verb, expression, phrasal verb, stop, drop)
8
slow up(verb, expression, phrasal verb, check, fail)
8
soothe(verb, calm, order, quiet, help)
8
temper(verb, calm, control, order, quiet)
8
unbend(verb, stop, calm, release, free)
7
alleviate(verb, calm, control, help, separate)
7
appease(verb, calm, control, order, quiet)
7
assuage(verb, calm, control, order, quiet)
7
dwindle(verb, stop, calm, drop, dull)
11 years ago|11k views|share |citing 
APASmart Define. (2015). slacken thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/slacken/thesaurus/synonyms
ChicagoSmart Define. 2015. "slacken thesaurus" https://smartdefine.org/slacken/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, slacken thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/slacken/thesaurus/synonyms>.
MLASmart Define. "slacken thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/slacken/thesaurus/synonyms>