heartless

UK: /ˈhɑː^rtləs/ US: /ˈhɑrtlɪs/ ,(härt′lis)

WordReference Random House Learner's Dictionary of American English © 2025

heart•less /ˈhɑrtlɪs/   adj. 

1. unfeeling;
   unkind;
   harsh;
   cruel:
   her cold, heartless attitude.

heart•less•ly, adv. 
heart•less•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

heart•less  (härt′lis), adj. 

1. unfeeling;
   unkind;
   unsympathetic;
   harsh;
   cruel:
   heartless words; a heartless ruler.
2. [Archaic.] lacking courage or enthusiasm;
   spiritless;
   disheartened.

• Middle English herteles, Old English heortlēas. See heart, -less 1300–50

heart′less•ly, adv. 
heart′less•ness, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

heartless / ˈhɑːtlɪs/ adjective

1. unkind or cruel; hard-hearted

ˈheartlessly adverb

ˈheartlessness noun