| 1. | thoughtless; heedless; inconsiderate: an unthinking, tactless person. |
| 2. | indicating lack of thought or reflection: a dull, unthinking expression on his face. |
| 3. | not endowed with the faculty of thought: unthinking matter. |
| 4. | not exercising thought; not given to reflection: This book will not profit an unthinking person. |
| 5. | not thinking; unmindful: chores done in an unthinking manner. |