정신이나 지적인 능력과 관련하여; 마음속으로.
In a way that relates to the mind, intellect, or psychological state; inwardly.
예문:
"She felt physically fine, but mentally she was exhausted after the long negotiation."
"He calculated the complex equation mentally before writing down the final answer."
"The doctor confirmed that the patient was mentally sharp despite his advanced age."