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Definitions

unthinking

[uhn-thing-king] / ʌnˈθɪŋ kɪŋ /
ADJECTIVE
careless
Synonyms
WEAK
blundering brutish feckless foolish heedless impulsive inadvertent inconsiderate indelicate insensitive instinctive mechanical napping negligent oblivious outrageous rash rude selfish senseless tactless thoughtless uncaring unconscious undiplomatic unheeding unintended unmeant unmindful unpremeditated unreasoning untactful unwise vacant witless
Antonyms
WEAK
careful cautious thoughtful

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.

He seems like an unthinking product of opportunity.

From The Wall Street Journal • Mar. 26, 2026

And that in turn prevents you from aimless or unthinking financial behavior.

From MarketWatch • Dec. 24, 2025

The piece talked down to Roan and diminished her requests as childish and unthinking — ironic for something as petulant as the column reads.

From Salon • Apr. 26, 2025

Mr Harvey admitted sending them a letter in April 2017 which he now acknowledged was “crass, inappropriate… unthinking and insensitive”.

From BBC • Nov. 30, 2024

He liked that smile, the quick unthinking way it came to her pretty face.

From "A Clash of Kings" by George R.R. Martin

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.