par·a·noi·a 
(p
ăr
′ə-noi
ə)
n.1. Irrational distrust or suspicion of others, especially as occurring in people with psychiatric disorders such as paranoid personality disorder and schizophrenia: paranoia about neighbors stealing from his vegetable garden.
2. Intense anxiety or worry: paranoia about losing her job.
[Greek, madness, from paranoos, demented : para-, beyond; see PARA-1 + nous, noos, mind.]