It will tell you which way the wind is blowing
Vain is an adjective--a vain man.
verbal irony
Vain already is an adjective.
In vain is means not effective, useless For an example: His discussion about changing the uniform is in vain
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.'
Vane, as in a weather vane
The rescue attempt was in vain, as the weather got worse and the search had to be called off.
Fanuiel Hall
Because he's vain and not particularly empathic.
A wind vane is used to indicate the direction of the wind. It has a pointer that aligns itself with the direction from which the wind is blowing. This information is useful for sailors, farmers, meteorologists, and anyone interested in knowing wind direction.
One homophone for "vain" is "vane," which refers to a thin, flat part that sticks out from a surface or shaft, often found on tools like arrows or weather vanes.
how can you tell when a weather change is coming
You will receive compliments but don't get vain about it as it is a turn off for woman.
Another name for vein is blood vessel.
meteorologists tell the weather by looking at the sky because of the clouds. Every cloud could tell the weather. Different types of clouds tell different weathers.
bbc weather
vane For example, a weather vane A moveable device attached to something high to show which way the wind isblowing