Definition of "wrongthink"

In other words I spent yesterday in bed with a headache not merely because of my bad attitudes, unpleasant tempers and wrongthink, but because both my grandmothers had migraine, my father has migraine and my mother has migraine.

1979, Joan Didion, The White Album

Fang, fearing for his job, had to issue a Maoist-style apology for reporting wrongthink.

2020 June 11, David Bernstein, “The Revolution is Eating its Own”, in The Volokh Conspiracy‎