Similar words: in course of time, in the course of time, ahead of time, in the nick of time, taste of, state-of-the-art, state of the art, estimated time of arrival. Meaning: n. the devotion of time to a useless activity.
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1. Waste of time is the most extravagant and costly of all expenses. 
2. What a waste of time and money.
3. Personally I think it's a waste of time.
4. In my view it was a waste of time.
5. It's a waste of time and energy.
6. It was a waste of time talking to him.
7. What a fearful waste of time and money.
8. It was, moreover, a waste of time.
9. Any unhappy is a waste of time.
10. The meeting was a complete and utter waste of time.
11. Worry is a total waste of time. It doesn't change anything. All it does is steal your joy and keep you very busy doing nothing.
12. The whole thing has been a complete waste of time.
13. This is a complete waste of time .
14. Ah ! This is a waste of time!
15. It was all a thoroughgoing waste of time.
16. It's a mere waste of time waiting any longer.
17. These meetings are a complete waste of time.
18. It was a thorough waste of time.
19. What a waste of time!
20. What a bloody waste of time!
21. What a fearful waste of time!
21. Wish you can benefit from sentencedict.com and make progress everyday!
22. 'It's a waste of time,' he concluded.
23. What a fucking waste of time!
24. I guess it sheer waste of time arguing about it.
25. It is a waste of time warning him—he is determined to go his own way.
26. I told you it was a waste of time talking to him.
27. That meeting achieved absolutely nothing - it was a complete waste of time.
28. He's very much of the opinion that alternative medicine is a waste of time.
29. I don't dislike sport qua sport I just think it's rather a waste of time.
30. There is a belief among young people that education is a waste of time.
More similar words: in course of time, in the course of time, ahead of time, in the nick of time, taste of, state-of-the-art, state of the art, estimated time of arrival, time off, oftentimes, take time off, at the time of, pastime, from time to time, time and time again, A stitch in time saves nine, loftily, prime time, write off, in spite of, take note of, plaster cast, past master, caste system, make a note of, rate of return, state of nature, rite of passage, rule of thumb, time.