Added 9 October 2026 thoughtless /ˈθɔːtləs/ adjective Categories: Describing WordsRare Words In Latin: incōgitātus Wiktionary adjective ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about thoughtless at Wordnik → Where our words come from → Showing lack of careful thought. the debate turned into thoughtless bickering 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' Related Words: heedlessunthoughtfulcarelessinconsiderateregardlessunthinkingunreflectiveuncaringunheedingunconsideredindifferentdeaf Back to today's word