unthinking

1 of 2

adjective

un·​think·​ing ˌən-ˈthiŋ-kiŋ 

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

unthinkingly

ˌən-ˈthiŋ-kiŋ-lē 

adverb

unthinking

2 of 2

present participle of unthink

Examples of unthinking in a Sentence

Adjective

His unthinking agreement made me uneasy.

Recent Examples on the Web

Adjective

Watching the slow, unthinking undulations of Technicolor bells trailing lengthy tentacles like slo-mo ribbon dancers is strangely soothing. — Jessica Kozuka, Travel + Leisure, 2 Aug. 2026

In contrast, Dessalines is typically described as violent, unthinking, emotional and heartless. — Julia Gaffield, The Conversation, 15 June 2026

Along the way, Daisy and Hoke each will confront, acknowledge and, in a way, overcome their own often-unthinking prejudice. — Oline Cogdill, Sun Sentinel, 9 Feb. 2026

To stay in that state of unthinking presence was like walking a tightrope only to suddenly look down, panic, and come plunging back to Earth. — Michael Pollan, The Atlantic, 26 Jan. 2026

Word History

First Known Use

Adjective

1676, in the meaning defined at sense 1

Rhymes for unthinking

• freethinking
• rethinking
• unblinking
• blinking
• clinking
• drinking
• inking
• kinking
• linking
• shrinking
• sinking
• slinking

Kids Definition

unthinking

adjective

un·​think·​ing ˌən-ˈthiŋ-kiŋ 

ˈən-

1

: not thinking : inattentive, thoughtless

unthinking people who litter the streets

2

: not having the power of thought

unthinkingly adverb