un·​think·​ing | \ˌən-ˈthiŋ-kiŋ \

Definition of unthinking 

1 : not taking thought : heedless, unmindful the unthinking onlookers

2 : not indicating thought or reflection an unthinking decision

3 : not having the power of thought

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Other Words from unthinking

unthinkingly \ ˌən-​ˈthiŋ-​kiŋ-​lē \ adverb

Examples of unthinking in a Sentence

His unthinking agreement made me uneasy.

Recent Examples on the Web

The caricature that has emerged of Johnson over the years is something of an unthinking brute, a byproduct of his physical gifts. Brian Costa, WSJ, "Dustin Johnson Opts for Poise Over Power at U.S. Open," 15 June 2018 Unlike the Corker-Kaine bill, this actually would require Congress to review the authorization on a periodic basis, preventing war from becoming this country’s unthinking default. Elizabeth Goitein, Fortune, "Congress Is About to Decide Whether to Give Trump More or Less Power to Expand Wars," 4 June 2018 The frenetic and unthinking clampdown on the seasonal visas has been disastrous for Maryland’s fragile and beloved blue crab industry. Petula Dvorak, Washington Post, "Many Maryland watermen deny the crab crisis is Trump’s fault. Except it is.," 7 May 2018 Develop your critical thinking: Robots are wired to be unthinking, uncaring, unemotional, uncritical, uninvolved, irresponsible clumps of hardware. Phil Blair, sandiegouniontribune.com, "Robots are coming for your job, so make sure you’re smarter," 7 May 2018 The evidence also suggests that blind, unthinking panic is rare. M. Mitchell Waldrop, Science | AAAS, "What if a nuke goes off in Washington, D.C.? Simulations of artificial societies help planners cope with the unthinkable," 12 Apr. 2018 That's why our unthinking response in the experiment is a generous one. Gaia Vince, CNN, "Why nice people become mean online," 3 Apr. 2018 Yet their failure, whether by accident or by unthinking design, can have catastrophic consequences for individuals and society alike. Yonatan Zunger, BostonGlobe.com, "Computer science faces an ethics crisis. The Cambridge Analytica scandal proves it.," 22 Mar. 2018 Leviathan by John Layman and Nick Pitarra: A group of unthinking quasi-magicians accidentally conjure up a demonic monster out to destroy all life on Earth. Graeme Mcmillan, The Hollywood Reporter, "Image Unveils Millarworld/Netflix Plans and New Comic Book Projects," 21 Feb. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unthinking.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of unthinking

1676, in the meaning defined at sense 1

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The first known use of unthinking was in 1676

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More Definitions for unthinking



English Language Learners Definition of unthinking

: done or said in a foolish or careless way without thinking about the possible effects : behaving in a foolish or careless way without careful thought


un·​think·​ing | \ˌən-ˈthiŋ-kiŋ \

Kids Definition of unthinking

: not thinking about actions or words and how they will affect others unthinking remarks

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Comments on unthinking

What made you want to look up unthinking? Please tell us where you read or heard it (including the quote, if possible).


something that serves to warn or remind

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