mentally
adv.connected to your mind and how you think. You use this to describe things that happen inside your head rather than in your body.
adv.relating to the mind or intellectual capacity. Often used to distinguish cognitive processes from physical or emotional ones.
“He is mentally exhausted after the long exam.”
“The athlete prepares for the race by mentally visualizing every turn of the track before the starting whistle blows.”
“While the physical injuries healed within weeks, the trauma left him mentally drained, requiring months of quiet reflection to regain his former confidence.”
Typically placed before the adjective it modifies or after the verb.
Learners often use the adjective 'mental' instead of the adverb 'mentally' to modify another adjective.
From mental + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.