thoughtless
Americanadjective
-
lacking in consideration for others; inconsiderate; tactless.
a thoughtless remark.
- Synonyms:
- neglectful, negligent
-
characterized by or showing lack of thought.
a shallow, thoughtless book.
-
not thinking enough; careless or heedless.
thoughtless of his health.
- Synonyms:
- remiss, inattentive
-
devoid of or lacking capacity for thought.
adjective
-
inconsiderate
a thoughtless remark
-
having or showing lack of thought
a thoughtless essay
-
unable to think; not having the power of thought
Other Word Forms
Derived Forms
Etymology
Origin of thoughtless
Explanation
When you're thoughtless about something, you don't spend much time thinking about what the consequences or effects on others might be. Smashing your neighbor's Jack-o-lantern was a thoughtless impulse you immediately regretted. If you've ever said, "I didn't really think about it hurting someone's feelings—I just did it," you've acted in a thoughtless way. This adjective is always at least a little bit negative, basically the opposite of thoughtful. It's thoughtless to invite everyone except the new kid at school to your birthday party, and it's thoughtless to throw trash on the ground instead of in a trash can. It's always better to stop and think first!
Vocabulary lists containing thoughtless
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Not with an impossible grading policy or a thoughtless change to my course, but by letting students use artificial intelligence on team assignments.
From The Wall Street Journal • Feb. 25, 2026
Am I wrong to think they are thoughtless?
From MarketWatch • Nov. 3, 2025
"People dismissing all AI-generated content as slop right now are being thoughtless, because there's a lot of great, compelling AI content that deserves their interest."
From Barron's • Oct. 13, 2025
Perkins has sought specific training on how to sort out credible threats online from thoughtless reposts, allowing her to focus on students who pose real danger instead of punishing everyone.
From Salon • Jul. 29, 2025
Oh why am I so coarse and thoughtless?
From "Code Name Verity" by Elizabeth Wein
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
