4
inhibit(verb, hold, keep, reduce, restrain)
4
lay
4
modify(verb, calm, drop, control, cut)
4
pacify(verb, calm, control, order, quiet)
4
palliate(verb, calm, quiet, help, reduce)
4
peter out(verb, expression, stop, drop, end)
4
quell(verb, stop, calm, drop, order)
4
quiet(verb, adjective, calm, drop, control)
4
reef
4
set back(verb, expression, phrasal verb, check, reduce)
4
still(verb, calm, order, quiet, help)
4
tame(verb, adjective, control, restrain, diminish)
4
taper(verb, stop, drop, dull, decline)
4
tone down(verb, expression, control, reduce, restrain)
4
unlax(verb, stop, calm, dull, fall)
3
blunt
3
bridle
3
countercheck
3
curtail(verb, drop, cut, decline, reduce)
3
cushion
11 years ago|11k views|share |citing 
APASmart Define. (2015). slacken thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/slacken/thesaurus/synonyms
ChicagoSmart Define. 2015. "slacken thesaurus" https://smartdefine.org/slacken/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, slacken thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/slacken/thesaurus/synonyms>.
MLASmart Define. "slacken thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/slacken/thesaurus/synonyms>