- Don't waste your time.
- Don't waste your time.You will not get anywhere with it, so don't waste time trying. •
Mary: Should I ask Tom if he wants to go to the convention, or is he still in a bad mood? Sally: Don't waste your time. Mary: Bad mood, huh?
•Jane: I'm having trouble fixing this doorknob. Mary: Don't waste your time. I've ordered a new one.
Dictionary of American idioms. 2013.