par·a·noid 
(părə-noid′)
(părə-noid′)adj.
1. Psychiatry Relating to, characteristic of, or affected with paranoia.
2. Exhibiting or characterized by irrational distrust or suspicion of others: a paranoid fear that the police car was following him.
3. Experiencing or displaying intense anxiety or worry: paranoid about catching the flu.
n.
One affected with paranoia.