men·​tal·​ly | \ ˈmen-tᵊl-ē How to pronounce mentally (audio) \

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

First Known Use of mentally

15th century, in the meaning defined at sense 1

Learn More About mentally

Time Traveler for mentally

Time Traveler

The first known use of mentally was in the 15th century

See more words from the same century

Dictionary Entries Near mentally



mentally retarded

See More Nearby Entries 

Statistics for mentally

Cite this Entry

“Mentally.” Dictionary, Merriam-Webster, Accessed 19 Jan. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on mentally

Nglish: Translation of mentally for Spanish Speakers

Britannica English: Translation of mentally for Arabic Speakers


Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
Spell It

Can you spell these 10 commonly misspelled words?

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!