It means that all the work and time put into achieving something have not led to the desired outcome or success.
Example sentence - His efforts were for naught as he had been given the wrong map.
His efforts were in vain.She was a very vain person.
The narrator believes that all his efforts to save himself are in vain because
if the jet stream is weak then all of the efforts will go down to vain
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)
All cooperative efforts made by states and the u.s. Department of Agriculture to make available a clean,safe,wholesome food supply will be in vain unless the consumer takes certain precautions to keep it that way.
How would you write All cooperative efforts made by states and the US Department of Agriculture to make available a clean safe wholesome food supply will be in vain unless the consumer takes certain precutions to keep it that way.
To do something in vain means to do it without success or without achieving the desired result. It implies that the effort put into the action was wasted because the outcome was not favorable or did not meet the intended goal.
They fought in a military-conflict, all they could do was hope the Nazi wouldn't get to them because there efforts generally were in vain
We are all vain about one thing or another, Vivs! 'You can always ask me" Savannahofthehills
But all the aid of the sand and all the prowess in the air would have been in vain without the sea.
The American efforts have been so good. They have been useless.