hypopsychosis

Example:He looked mentally vacant, completely lost in thought.

Definition:In a state of being mentally empty or lacking in clear thought; often used to describe someone who appears unfocused or absent-minded.

Example:She was so absent-minded that she walked right into the pillar.

Definition:Occupied with one's own thoughts to the point of forgetting or disregarding surroundings; typically used to describe someone who seems lost in thought.

Example:Her mental fatigue was so evident that she appeared to be in a hypopsychosis state at her desk.

Definition:Experiencing a state of mental weakness or exhaustion; often due to prolonged mental effort or stress.