Adjective
heartless (comparative more heartless, superlative most heartless)
- Without feeling, emotion, or concern for others; uncaring; cruel. [from 16th c.]
- Synonyms: cold-hearted, uncordial
- Antonyms: hearty, heartful; cordial
- Coordinate terms: soulless, thoughtless, mindless
His heartless actions and cold manner left her saddened and feeling alone.
1982 August 14, Michael Bronski, “If You Hated The Book You'll Loathe The Movie”, in Gay Community News, volume 10, number 5, page 11:The world is a dangerous, violent place […] and the only true refuge from this heartless world is the family.
2012 April 29, Nathan Rabin, “TV: Review: THE SIMPSONS (CLASSIC): “Treehouse of Horror III” (season 4, episode 5; originally aired 10/29/1992)”, in The A.V. Club:Mr. Burns is similarly perfectly cast as a heartless capitalist willing to do anything for a quick buck, even if it means endangering the lives of those around him and Marge elegantly rounds out the main cast as a good, pure-hearted and overly indulgent woman who sees the big, good heart (literally and metaphorically) of a monstrous man-brute.
- Without a physical heart. [from 15th c.]
- Synonym: acardiac
- (now rare) Listless, unenthusiastic. [from 14th c.]
- Antonyms: hearty, heartful
- Coordinate term: halfhearted
- Near-synonyms: spiritless, unhearty
- (obsolete) Without courage; fearful, cowardly. [10th–19th c.]
- Synonyms: spineless, gutless, unhearty; see also Thesaurus:cowardly
- Antonym: dauntless
1782, Frances Burney, Cecilia, II.iii.7:Cecilia then, though almost heartless, resolved upon talking with Mr. Harrel himself […].