unlikely vs unconvincing

unlikely and unconvincing both are adjectives.

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

As adjectives, unlikely and unconvincing are synonyms defined as:

unlikely and unconvincing: having a probability too low to inspire belief

Other synonyms of unlikely include improbable, unbelievable.

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