Noun
(psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness
Source: WordNetIn the mental disturbance and effort of writing, what sustains you is the certainty that on every page there is something left unsaid. Cesare Pavese
Hoplophobia is a mental disturbance characterized by irrational aversion to weapons, as opposed to justified apprehension about those who may wield them. Jeff Cooper