simple past tense and past participle of possess
"The old house was possessed by a strange energy after they moved in."
In plain English: To be possessed means to have something completely taken over by an outside force, leaving you unable to control yourself.
"The strange noise seemed possessed by some unseen force until we found out it was just the wind outside."
of, pertaining to, or like a demon or possession by a demon
"The villagers believed that strange noises coming from the house were caused by a spirit possessed the owner."
controlled by evil spirits.
"The villagers believed the dancer was possessed and fled from her terrifying movements."
In plain English: Possessed means having something so strong that you can't control yourself anymore.
"The possessed dog ran wildly through the neighborhood after chasing its tail for too long."