Many English learners make the mistake of saying “unuseful” when they really mean “useless.”
But “unuseful” is not a common or natural word in English.
✅ Correct: This tool is useless.
❌ Wrong: This tool is unuseful.
“Useless” means something does not help you. It has no use.
Use + less = useless (no use)
Here are more examples with “-less” words (not “un-”):
❌ Don’t Say ✅ Say Meaning
unpowerful --> powerless = no power or strength
unhopeful --> hopeless = no hope
uncareful --> careless = not careful
unthankful --> thankless = no thanks or reward
Tip: If you are not sure, try using a “-less” word instead of adding “un-.” Many times, it will sound more natural.
Now you know—don’t say unuseful. Say useless!