Unjustified suspicion and mistrust of other people or their actions.
He began to feel he was suffering from paranoia.
She's paranoid about going out at night alone.
Her paranoia heightened in unfamiliar surroundings, causing her to constantly check her surroundings.
The spy's paranoia led to a series of elaborate precautions to ensure secrecy and protection.
His paranoia about cybersecurity prompted him to use multiple layers of encryption for sensitive data.
The paranoia in the community grew as rumors of an impending crisis circulated without concrete evidence.
