unthinkingly

UK: /ˌʌnˈθɪŋkɪŋli/

WordReference Random House Learner's Dictionary of American English © 2025

un•think•ing /ʌnˈθɪŋkɪŋ/   adj. 

1. thoughtless;
   inconsiderate.
2. not thinking;
   heedless.

WordReference Random House Unabridged Dictionary of American English © 2025

un•think•ing  (un thing′king), adj. 

1. thoughtless;
   heedless;
   inconsiderate:
   an unthinking, tactless person.
2. indicating lack of thought or reflection:
   a dull, unthinking expression on his face.
3. not endowed with the faculty of thought:
   unthinking matter.
4. not exercising thought;
   not given to reflection:
   This book will not profit an unthinking person.
5. not thinking;
   unmindful:
   chores done in an unthinking manner.

• un-¹ + thinking 1670–80

un•think′ing•ly, adv. 
un•think′ing•ness, n.