/ ˈmaɪndləs; NAmE / adjective
1.
done or acting without thought and for no particular reason or purpose;
SYN senseless :
mindless violence
mindless vandals
2.
not needing thought or intelligence
SYN dull :
a mindless and repetitive task
3.
mindless of sb/sth ( formal ) not remembering sb/sth and not considering them or it when you do sth :
We explored the whole town, mindless of the cold and rain.
► mind·less·ly adverb