unlikely vs implausible

unlikely and implausible both are adjectives.

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

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