10
asseverate(verb, state, hold, press, maintain)
10
certify(verb, support, state, show, maintain)
10
depone(verb, phrasal verb, law, give, appear)
10
undertake(verb, agree, declare, approve, uphold)
9
revile(verb, attack, sound, abuse, criticize)
9
verify(verb, state, hold, show, confirm)
9
vouch(verb, state, maintain, declare, tell)
9
vouchsafe(verb, promise, vow)
8
agree(verb, contract, promise)
8
bear witness(verb, expression, idiom, law, give)
8
confirm(verb, support, state, show, maintain)
8
covenant(noun, verb, agree, declare, agreement)
8
execrate(verb, attack, abuse, condemn, denounce)
8
trust(verb, declare)
7
avouch(verb, state, press, maintain, declare)
7
insist(verb, state, hold, order, press)
7
say(verb, state, hold, press, maintain)
7
take an oath(verb, expression, idiom, declare, approve)
6
adjure(show, confirm, prove, appear, promise)
6
bank
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APASmart Define. (2016). swear thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/swear/thesaurus/synonyms
ChicagoSmart Define. 2016. "swear thesaurus" https://smartdefine.org/swear/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, swear thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/swear/thesaurus/synonyms>.
MLASmart Define. "swear thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/swear/thesaurus/synonyms>