11
withstand(verb, support, hold, take, meet)
10
assist(verb, support, hold, help, increase)
10
brace(verb, support, hold, calm, take)
10
buttress(noun, verb, support, hold, calm)
10
encourage(verb, support, help, give, increase)
10
guard(verb, support, hold, fix, keep)
10
help(verb, support, hold, keep, maintain)
10
hold up(verb, expression, phrasal verb, support, hold)
10
persist(verb, hold, advance, keep, maintain)
10
save(verb, support, hold, keep, maintain)
9
put up with(verb, expression, idiom, phrasal verb, support)
8
allow(verb, support, hold, take, give)
8
back up(verb, expression, phrasal verb, support, increase)
8
brook(verb, support, hold, take, meet)
8
certify(verb, support, show, determine, favor)
8
extend(verb, support, advance, increase, maintain)
8
favor(verb, support, help, give, keep)
8
fortify(verb, support, hold, increase, develop)
8
keep going(verb, expression, idiom, support, move)
8
prove(verb, state, feeling, show, put)
11 years ago|33k views|share |citing 
APASmart Define. (2015). sustain thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/sustain/thesaurus/synonyms
ChicagoSmart Define. 2015. "sustain thesaurus" https://smartdefine.org/sustain/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, sustain thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/sustain/thesaurus/synonyms>.
MLASmart Define. "sustain thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/sustain/thesaurus/synonyms>