Goodthink, a term used in the superstate of Oceania during the late 20th century, is a Newspeak word signifying a set of thoughts and beliefs that is in accordance with those established by the Party.
In the rules of Newspeak the noun stem (which also serves as a verb) can become the adjective goodthinkful, the adverb goodthinkwise, the past participle goodthinked, and the gerund goodthinking. Additionally, one who is "goodthinkful" is referred to as a goodthinker. The opposite of goodthink is crimethink. However, according to the common rules of Newspeak words do not have opposites, and one would just add the prefix un- to the word.