Unlikely synonyms such as cock and bull, absurd, and beyond belief. Unlikely is an adjective, and its antonyms are likely, certain, and believable. Additionally, here are 28 synonyms for unlikely and words similar to it.
Absurd, beyond belief, cock and bull, doubtful, dubious, fabulous, fanciful, fantastic, far-fetched, hard to swallow/take, implausible, improbable, inconceivable, incredible, laboured, not likely, preposterous, questionable, remote, ridiculous, strained, tall, unbelievable, unconvincing, unexpected, unimaginable, and unrealistic.