unnatural vs abnormal

unnatural and abnormal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unnatural	No	Yes	No	No
abnormal	No	Yes	No	No

As adjectives, unnatural and abnormal are synonyms defined as:

unnatural and abnormal: not normal; not typical or usual or regular or conforming to a norm

unnatural (adjective)	abnormal (adjective)
not in accordance with or determined by nature; contrary to nature	not normal; not typical or usual or regular or conforming to a norm
not normal; not typical or usual or regular or conforming to a norm	departing from the normal in e.g. intelligence and development
speaking or behaving in an artificial way to make an impression	much greater than the normal