mindless /maɪnd.ləs/adjective 5forms 2phrases 1 adjective5 •Lacking a mind.Atheism alleges that mindless scientific forces control the universe. •Showing a lack of forethought or sense. •Having no sensible meaning or purpose.An act of mindless violence. •Heedless. •Overly repetitive and unchallenging, not requiring any careful attention or providing any significant stimulation. formsmore mindless · most mindless Phrases with mindless meeting of the mindlessA gathering of people whose views differ greatly.