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Definition of thoughtlessness

thoughtlessness

/ˈθɔːt.ləs.nəs/
thought · less · ness
Adverb:thoughtlessly
•
Plural:thoughtlessnesses
•
Adjective:thoughtless
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thoughtlessness Lexical Profile

thoughtlessness Game Scores & Validity

• noun

1

A lack of consideration or regard for the needs, feelings, or well-being of others.

Example

"She quickly apologized for her thoughtlessness in forgetting to invite her new colleague to the luncheon."

2

A failure to give sufficient careful attention or forethought to an action and its consequences.

Example

"The hiker's thoughtlessness in leaving the campfire unattended nearly sparked a major forest fire."

Synonyms
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Antonyms
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• Nearby Words

thoughtfulness
thoughtless
thoughtlessly
thoughtlessness
thousand
thousandfold
thousandth

Word Origin & Etymology

Formed in English from the adjective 'thoughtless' (first recorded in the late 16th century) combined with the Old English abstract noun suffix '-ness'.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

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