- thoughtless; heedless; inconsiderate: an unthinking, tactless person.
- indicating lack of thought or reflection: a dull, unthinking expression on his face.
- not endowed with the faculty of thought: unthinking matter.
- not exercising thought; not given to reflection: This book will not profit an unthinking person.
- not thinking; unmindful: chores done in an unthinking manner.
- lacking thoughtfulness; inconsiderate
- heedless; inadvertent
- not thinking or able to think
