Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “thoughtless”


adjective  /ˈθɔt·ləs/ us  
not showing care for others: I’m sorry I was late – it was thoughtless of me not to call.
adverb  /ˈθɔt·ləs·li/ us  
He thoughtlessly made an unkind remark about her mother.
(Definition of thoughtless from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of thoughtless?
Browse related topics

You are looking at an entry to do with Not showing careful thought, but you might be interested in these topics from the Attention and care topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “thoughtless” in other dictionaries

Word of the Day


to send something through the air with force, especially by a sudden movement of the arm

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More