Mental (adjective)

1. Relating to the mind or intellect.
2. Relating to mental illness.
3. Requiring or using mental abilities.
4. Having a psychological, rather than a physical, basis.

Origin:

From late latin 'mentalis' (of the mind), from latin 'mens' (mind).

Examples:

1. The patient was diagnosed with a mental disorder.
2. Playing chess requires a lot of mental concentration.
3. The exam was very mental and required a lot of critical thinking.
4. The therapist said that the patient's issues were more mental than physical.
5. The team's success was due to their mental toughness.