paranoiac

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adjective

para·​noi·​ac -ˈnȯi-ˌak  -ˈnȯi-ik 

variants also paranoic

-ˈnō-ik 

: of, relating to, affected with, or characteristic of paranoia or paranoid schizophrenia

paranoiac

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noun

variants also paranoic

: paranoid