Paranoia is a feeling of intense fear or distrust, often without any logical reason. It is when a person believes that others are plotting against them or that they are constantly being watched. Full definition
Moreover, Mallick also instills the sense of paranoia of the time, as the viewer sporadically hears the sound of whispers, primarily from Jack, who speaks out to the various themes of the film: spirituality, compassion, regret, fear, anger, sadness, and wonder — all elements of everyday life. (metacritic.com)
What is the Obama administration hiding that causes this level of paranoia about even friends? (spiegel.de)
There is even a tag before the film starts warning viewers about the presence of flashing lights and hallucinatory images in the film, automatically instilling a sense of paranoia in the audience that we share with Darling. (bloody-disgusting.com)