not likely to be or occur; improbable; marked by doubt.

holding little prospect of success; unpromising; likely to fail

He is an unlikely candidate for reelection.

not ingratiating; objectionable.

in an unlikely way.

adjective

imaginable , likely , probably

adjective

absurd , contrary , doubtful , dubious , faint , implausible , improbable , inconceivable , incredible , not likely , out of the ordinary , outside chance , questionable , rare , remote , slight , strange , unbelievable , unconvincing , unheard-of , unimaginable , untoward , unapt , dubitable , except , hopeless , nisi , save , unfit , unpromising , unsuitable