adj, verb ·3 syllables ·Common ·High school level

Definitions

Verb

1. 1
   present participle and gerund of unthink form-of, gerund, participle, present

Adjective

1. 1
   Without proper thought; thoughtless.
2. 2
   Showing no regard; careless or unconcerned.

Adjective

1. 1
   mentally sluggish wordnet
2. 2
   without care or thought for others wordnet
3. 3
   not exhibiting or characterized by careful thought wordnet

Adverb

1. 1
   in a thoughtless manner wordnet

Synonyms

All synonyms

inconsideratestupiduncaringunreflectiveairyarbitrary

Antonyms

All antonyms

consideredthinkingmeticulousruminative

Example

More examples

"Unthinking respect for authority is the greatest enemy of truth."

Etymology

From un- + thinking.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.