Part of speech:
Not likely to be true.
Not determined by reason; capricious; arbitrary; irrational.
Not promising; likely to fail.
The definition of doubtful is suspicious, unclear or unsure.
The definition of dubious is something that is unlikely to be true.
(Informal) Inspiring doubt or suspicion:
Ill-conceived and inadequate; ineffectual
Open to or viewed with suspicion:
Not functioning normally or well
Persuasive or ingratiating, especially in an effort to deceive.
Within the realm of credibility; plausible:
Capable of eliciting belief or trust.
Not excessive or extreme; fair:
So implausible as to elicit disbelief; unbelievable:
Not dependable or reliable; questionable
Having little bodily flesh or fat; lean or slender.
Not solid or heavy; flimsy; light
Find another word for implausible. In this page you can discover 37 synonyms, antonyms, idiomatic expressions, and related words for implausible, like: inconceivable, improbable, unbelievable, farfetched, ridiculous, unconceivable, unreasonable, impossible, unlikely, doubtful and dubious.