Would you say this is a word? As in "you have time-wasteful habits". I would say it sounds more general than "time-wasting", which seems to say someone is wasting time in a specific context.
Top answer
A common replacement word for it is "time-consuming". Golf is very time-consuming. Golf is a time-consuming sport.
— Wilpeter
A common replacement word for it is "time-consuming".
Golf is very time-consuming.
Golf is a time-consuming sport.
Free · every Monday
Get the Weekly English Kit 📬
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
I see, but I want to retain the meaning of "waste". If something is "useless", it may still be a valid way to spend one's time. One wold not necessarily point out to someone who loves golf that he is wasting his time. That would just open up a strange conversation of pros and cons and subjective preferences.
Although time-wasting is in Collins’ dictionary, time-wasteful hasn’t yet made it. That doesn’t mean that it isn’t understandable; so by all means use it. Both ‘time’ and ‘wasteful’ are clear in meaning and are acceptable.