7
strengthen(verb, close, set, fix, advance)
7
widen(verb, set, advance, increase, open)
6
augment(verb, advance, increase, open, develop)
6
freeze(verb, form, close, set, fix)
6
lengthen(verb, advance, increase, open, develop)
6
swell(verb, set, advance, increase, develop)
5
amplify(verb, advance, increase, open, develop)
5
brace(noun, verb, close, set, fix)
5
buttress(verb, close, set, fix, settle)
5
crystallize(verb, form, close, set, fix)
5
extend(verb, advance, increase, open, develop)
5
fix(verb, close, set, secure, settle)
5
incrassate(verb, density, semiliquidity)
5
inflate(verb, advance, increase, develop, raise)
5
intensify(verb, advance, increase, raise, gain)
5
reinforce(verb, close, set, fix, advance)
4
burgeon(verb, advance, increase, open, develop)
4
compress(verb, concentrate, squeeze, curtail, compact)
4
concentrate(verb, develop, secure, join, unite)
4
concrete(verb, close, set, firm, dry)
11 years ago|6.5k views|share |citing 
APASmart Define. (2015). thicken thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/thicken/thesaurus/synonyms
ChicagoSmart Define. 2015. "thicken thesaurus" https://smartdefine.org/thicken/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, thicken thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/thicken/thesaurus/synonyms>.
MLASmart Define. "thicken thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/thicken/thesaurus/synonyms>