Synonyms of unlikely

1 Syllable
faint, slight, rare
2 Syllables
dubious, reachy, strange, absurd, doubtful, fishy, suspect, standout, rarest, unfit
3 Syllables
untoward, subtilest, contrary, remote, fantastic, far-fetched, rarer, subtiler, farfetched, doubtable, marvelous, unheard-of
4 Syllables
unrenowned, implausible, questionable, unconvincing, ill-equipped, unthinkable, improbable, incredible
5 Syllables
insupposable, hundred-to-one, inconceivable, unbelievable
6 Syllables
unimaginable