mental vs genial

mental and genial both are adjectives.

Word	Noun	Adjective	Verb	Adverb
mental	No	Yes	No	No
genial	No	Yes	No	No

As adjectives, mental and genial are synonyms defined as:

mental and genial: of or relating to the chin or median part of the lower jaw

mental (adjective)	genial (adjective)
involving the mind or an intellectual process	of or relating to the chin or median part of the lower jaw
of or relating to the mind	diffusing warmth and friendliness
of or relating to the chin- or liplike structure in insects and certain mollusks	agreeable, conducive to comfort
of or relating to the chin or median part of the lower jaw
affected by a disorder of the mind