1. lacking affection or warm feeling - an uncaring person • Syn: detached, unaffectionate • Similar to: unloving 2. without care or thought for others - the thoughtless saying of a great princess on being informed that the people had no bread; 'Let them eat cake' • Syn: thoughtless, unthinking • Similar to: inconsiderate • Derivationally related forms: thoughtlessness (for: thoughtless)