- not using one's mind; showing little or no intelligence or intellect; senseless or thoughtless
- taking no thought; heedless or careless (of); unmindful
- a. Lacking intelligence or good sense; foolish.b. Having no intelligent purpose, meaning, or direction: mindless violence.
- Giving or showing little attention or care; heedless: mindless of the dangers.
(comparative more mindless, superlative most mindless)
From Middle English myndeles, from Old English myndlÄ“as (“foolish, senseless"), equivalent to mind +"Ž -less.