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.
That is the correct spelling.
Yeah the right spelling is murderer
??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
The correct spelling is entrust.
Begging is the correct spelling.
The correct spelling is woolen.
The correct spelling is valentine.
NO! The correct spelling is spinach.
Harass is the correct spelling.
No. It is brochure.
Yes, you have the correct spelling for insane.