3
prolong(verb, increase, extend)
3
redouble(verb, reduce)
3
strengthen(verb, increase, reduce, destroy, halt)
2
add(verb, increase, adjoin)
2
aggravate
2
amend
2
balloon
2
boost(stop, reduce, contract)
2
burgeon
2
consolidate(hurt, decrease, weaken)
2
deepen(lower, weaken)
2
dilate(verb, cut, contract, stretch, widen)
2
distend(reduce, deflate)
2
emerge(drop, disappear)
2
multiply(verb, increase, destroy, decrease, reproduce)
2
mushroom
2
rise(verb, stop, end, increase, extend)
2
snowball(lower, decrease, weaken)
2
surge(verb, decline)
2
swell(noun, drop, decrease)
10 years ago|3.9k views|share |citing 
APASmart Define. (2016). lessen thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/lessen/thesaurus/antonyms
ChicagoSmart Define. 2016. "lessen thesaurus" https://smartdefine.org/lessen/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2016, lessen thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/lessen/thesaurus/antonyms>.
MLASmart Define. "lessen thesaurus" 31 January 2016. Web. 23 September 2026. <https://smartdefine.org/lessen/thesaurus/antonyms>