adjective Date: 1592 1. insufficiently alert ; careless , reckless , rash , devoid of thought ; insensate , lacking concern for others ; inconsiderate , ~ly adverb ~ness noun
THOUGHTLESS
Meaning of THOUGHTLESS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012