Synonyms of implausible

1 Syllable

thin, weak

2 Syllables

puzzling, dubious, reachy, flimsy, doubtful, fishy, suspect

3 Syllables

ironic, fantastic, obscure, far-fetched, farfetched, marvelous

4 Syllables

unconvincing, illogical, unthinkable, unreliable, double-edged, impossible, improbable, problematic, extravagant, incredible, unsubstantial, unlikely

5 Syllables

unreasonable, unsustainable, insupposable, paradoxical, hundred-to-one, inconceivable, unbelievable

6 Syllables

counterintuitive, uncomplimentary