heartless vs flinty

heartless and flinty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
heartless	No	Yes	No	No
flinty	No	Yes	No	No

heartless (adjective)	flinty (adjective)
lacking in feeling or pity or warmth	containing flint
devoid of courage or enthusiasm	showing unfeeling resistance to tender feelings