adj.
Pronunciation: -l ə s
Function: adjective
Date: 1592
1 a : insufficiently alert : CARELESS b : RECKLESS , RASH < thoughtless actions>
2 : devoid of thought : INSENSATE
3 : lacking concern for others : INCONSIDERATE <rude and thoughtless behavior> <a thoughtless remark>
– thought · less · ly adverb
– thought · less · ness noun