Simple past tense and past participle of waste time.
Wiktionary
Wasted-time Sentence Examples
Don't get in a hurry and make a mistake you that will cost you wasted time and hurt feelings.
Gallatin never wasted time in futile complaints.
If we had narrowed our market definition at the start, however, we would have avoided all the wasted time and increased our chances of making the startup a success.
It's a recipe for both wasted time and wasted money.
This helps to reduce wasted time and eliminate procrastination.
