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

Examples of mentally in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
England have looked physically exhausted and mentally congested in each of their four matches to date. Phil Hay, New York Times, 4 July 2026 Even five minutes of deliberate closure can help people mentally land before the next demand begins. Gerald J. Leonard, Forbes.com, 29 June 2026 Her grandfather was mentally ill, an alcoholic; her grandmother attempted suicide multiple times in a nearby river. Literary Hub, 26 June 2026 However, once the moon slips into Aquarius, the atmosphere takes on a more cerebral, independent and mentally stimulating vibe. Valerie Mesa, PEOPLE, 1 July 2026 See All Example Sentences for mentally

Word History

First Known Use

15th century, in the meaning defined at sense 1

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

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Cite this Entry

“Mentally.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mentally. Accessed 9 Jul. 2026.

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