An irrational and persistent feeling that other people are plotting against you, watching you, or intending to cause you harm.
From Greek 'paranoia' meaning 'madness, mental derangement,' from 'para-' (beside, beyond) + 'noos' (mind).
Paranoia is your brain's threat detector gone haywire — it sees conspiracies and enemies everywhere, even in the kindest gestures.
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