schizophrenia
(n.) a long-term mental disorder of a type involving a breakdown in the relation between thought, emotion, and behaviour, leading to faulty perception, inappropriate actions and feelings, withdrawal from from reality and personal relationships into fantasy and delusion, and a sense of mental fragmentation.
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a/n: if you love luke hemmings and read fan fiction, i suggest you should read [schizophrenia by parahmore] if you haven't already ((btw, i got this word and definition from her)) :-D