brainwashed
adj.adj. describing someone who has been forced or tricked into believing something that is not true. You use this when a person's ideas have been completely changed by someone else's influence.
adj. characterised by having undergone a systematic process of indoctrination to alter beliefs or attitudes. Often used predicatively after linking verbs like 'seem' or 'become'.
He seems brainwashed by that strange political group.
Family members feared the young man had been brainwashed by the cult's charismatic leader.
Critics argued that the constant stream of state propaganda had left the population effectively brainwashed, making them unable to question the government's increasingly erratic policies.
Often used as a participial adjective to describe a mental state rather than the active process.