Synonyms of hundred-to-one

1 Syllable
slim, rare, weak
2 Syllables
dubious, flimsy, iffy, doubtful, no-go, no-way, noway
3 Syllables
fanciful, far-fetched, uncertain
4 Syllables
implausible, questionable, unconvincing, impossible, improbable, unsubstantial, unworkable, unlikely
5 Syllables
irrealizable, unrealizable, inconceivable, unbelievable
6 Syllables
unimaginable