by nature (adjective) dogmatic: based on absolute truth
Sinonime: attestant, attester, attestor, beholder, bystander, corroborator, deponent, eyewitness, gawker, looker-on, observer, onlooker, proof, rubbernecker, signatory, signer, spectator, testimony, viewer, watcher
Antonime: ambiguous,
doubtful,
dubious,
equivocal, fluctuating,
indecisive, not positive,
uncertain,
vacillating