Main Entry: un·think·ing

Pronunciation: \ˌən-ˈthiŋ-kiŋ\

Function: adjective

Date: 1676

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

— un·think·ing·ly \-kiŋ-lē\ adverb