paranoiac

adj

1. Pertaining to, or exhibiting, paranoia.

   “Calm yourselves. The hysteria and opulent paranoiac fantasies that have spread over GCN’s pages in the wake of the general election constitute a reaction both shortsighted and silly.”

noun

1. Somebody who has paranoia, a paranoid person.

   “"Prove to me that I'm wrong when I say you are all just like person X from your group!" This is the cry of the bigot, the paranoiac, the pigeonholer, the witchhunter. Why need we prove what is self-evident?”