(Archaic) Not well considered or carefully thought out; ill-advised:
Not stopping to think; careless
Not taking due thought; thoughtless or heedless:
Not reflective; unthinking.
Thorough and painstaking in action or execution; conscientious:
Find another word for unthoughtful. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for unthoughtful, like: inconsiderate, thoughtless, unthinking, disregardful, unreflective, careful and courtesy.