Synonyms of the word

heartless

• adj. Without a heart; specifically, without feeling, emotion, or concern for others; uncaring.

flinty

• adj. Resembling or containing flint.
• adj. (geology) Silieceous (including basanite).
• adj. Showing a lack of emotion.
• adj. Having a taste characteristic of certain white wines, especially Chablis, supposed to evoke the sensation…

granitic

• adj. Of, pertaining to, or containing granite.

hardhearted

• adj. Lacking in compassion; cold and pitiless.

obdurate

• adj. Stubbornly persistent, generally in wrongdoing; refusing to reform or repent.
• adj. (obsolete) Physically hardened, toughened.
• v. (transitive, obsolete) To harden; to obdure.

spiritless

• adj. Lacking energy, drive, motivation or emotion. Enervated.

stony

• adj. As hard as stone.
• adj. Containing or made up of stones.
• adj. (figuratively) Of a person, lacking warmth and emotion.
• adj. (figuratively) Of an action such as a look, showing no warmth of emotion.