5
prove(verb, confirm, story, verify, substantiate)
5
raise(verb, get, fix, advance, increase)
5
rise(verb, advance, increase, develop, raise)
5
rouse(verb, increase, develop, promote, encourage)
5
secure(verb, support, develop, join, unite)
5
sharpen(verb, advance, increase, raise, rise)
5
supplement(verb, support, help, advance, increase)
5
validate(verb, confirm, story, verify, substantiate)
4
add(verb, increase, improve, boost, swell)
4
assist(verb, support, help, advance, develop)
4
brace up(verb, expression, phrasal verb, encourage, boost)
4
condense(verb, develop, secure, join, unite)
4
embolden(verb, encourage, excite, prepare, boost)
4
enable(verb, fix, power, stimulate, excite)
4
entrench(verb, support, secure, establish, protect)
4
establish(verb, hold, open, start, secure)
4
exacerbate(verb, increase, raise, severe, boost)
4
exalt(verb, get, fix, increase, develop)
4
grow(verb, charge, increase, develop, promote)
4
mass(verb, get, charge, increase, develop)
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APASmart Define. (2016). strengthen thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/strengthen/thesaurus/synonyms
ChicagoSmart Define. 2016. "strengthen thesaurus" https://smartdefine.org/strengthen/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, strengthen thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/strengthen/thesaurus/synonyms>.
MLASmart Define. "strengthen thesaurus" 3 March 2016. Web. 27 September 2026. <https://smartdefine.org/strengthen/thesaurus/synonyms>