Mental behaviour

psychosis
(n)
sigh-CO-sis
Meaning

a mental state characterized by hallucinations (that is, seeing and hearing things that are not really there) and delusions (that is, profoundly unrealistic beliefs)

1st Sample Sentence

At fifteen, he was struck by a paranoid psychosis that caused him to suspect that his family was secretly plotting to kill him.

Root

psykhe (breath, soul, mind) (Greek)#osis (abnormal condition) (Latin)

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