implausible vs unlikely

implausible and unlikely both are adjectives.

Word	Noun	Adjective	Verb	Adverb
implausible	No	Yes	No	No
unlikely	No	Yes	No	No

implausible (adjective)	unlikely (adjective)
having a quality that provokes disbelief	has little chance of being the case or coming about
	not likely to be true or to occur or to have occurred
	having a probability too low to inspire belief