men·tal·ly | \ ˈmen-tᵊl-ē 
\
\Definition of mentally
1 : in the mind
Mentally he promised himself that he would never again use a collar on any living creature.— Brian Jacques : using the mind
able to mentally calculate large sums
2 : with regard to the mind or its capacity
physically and mentally healthy people a mentally competent adult a mentally challenging activity … if you try to hide the fact that you feel mentally inadequate, and so go around making jokes about your own dullness and acting as if it didn't bother you at all …— David Foster Wallace I felt too hungry and tired and mentally overloaded to ask any more questions.— Rick Riordan
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Time Traveler for mentally
The first known use of mentally was in the 15th century
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