The correct spelling is efficient.
Some example sentences are:
We need a more efficient fuel source.
He is very efficient at what he does.
I recommend this, it is the most efficient product we have.
The right spelling is atmosphere.
Yeah the right spelling is murderer
That is the correct spelling.
??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
The correct spelling is entrust.
The correct spelling is woolen.
Begging is the correct spelling.
The correct spelling is valentine.
NO! The correct spelling is spinach.
Harass is the correct spelling.
Yes, that is the correct spelling of themselves.
Yes, you have the correct spelling for insane.