unthinking
adjective /ʌnˈθɪŋkɪŋ/
  /ʌnˈθɪŋkɪŋ/
(formal)- not thinking about the effects of what you do or sayExtra Examplessynonym thoughtless
- Unthinking, he started to cross the road.
 - She blushed at being caught out in such unthinking prejudice.
 - Toby's unthinking words came back to me.
 
Oxford Collocations DictionaryUnthinking is used with these nouns:- conformity