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Definition of thoughtless

thoughtless

/ˈθɔːt.ləs/
thought · less
Adverb:thoughtlessly
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thoughtless Lexical Profile

thoughtless Game Scores & Validity

• adjective

1

Showing a lack of consideration for the feelings, needs, or convenience of others.

Example

"It was thoughtless of him to leave the kitchen in such a mess right before his roommates hosted dinner."

2

Done or acting without proper reflection, care, or attention to potential consequences.

Example

"A single thoughtless mistake in the calculation delayed the engineering project by two weeks."

Synonyms
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Antonyms
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• Nearby Words

thoughtful
thoughtfully
thoughtfulness
thoughtless
thoughtlessly
thoughtlessness
thousand

Word Origin & Etymology

Formed in Middle English from the noun 'thought' (from Old English 'thoht') and the privative suffix '-less' (from Old English '-leas', meaning 'devoid of').

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Thoughtless. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/thoughtless
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