Synonyms of unconvincing

1 Syllable
lame, weak
2 Syllables
reachy, flimsy, feeblest, feebler, suspect, strengthless
3 Syllables
unpleasing, far-fetched, farfetched
4 Syllables
implausible, questionable, unreliable, improbable, incredible, unlikely, unfateful
5 Syllables
unconceivable, insupposable, unpersuasive, inconclusive, hundred-to-one, inconceivable, unbelievable