in vain means the expected result is not going to happen
To do something in vain means that you do not succeed in doing what you are trying to do; to try in vain is to fail.
I think you mean "vain".
for no point
To die in vain means that you died for a cause but your death did not change anything.
Vain means conceited, or it may mean to no avail. Here are some sentences.She tried in vain to stand on her head.He was as vain as a peacock."You're so vain!" (a song by Carly Simon)
Vain
Without effect or to no purpose
That you lived and died for no purpose.
Obsessed with looks
Well...You just need to know what vain means.'It is vain to do with more what can be done with fewer.'or'My sister is so vain that she talks to herself in the mirror.'or'Some people are vain enough to laugh at ugly people.'
The adjective vain is related to the noun vanity (ego). The related adverb form is vainly, but it can also mean futilely.
In vain. Let's say Yugi sacrificed Kuriboh for Summoned Skull, but his opponent used Trap hole. Kuriboh's Sacrifice was in vain. It basically means Kuriboh was sacrificed for no reason. So his sacrifice was "In vain."