Having the characteristics or qualities of a cult; fanatical, devoted, or marked by unusual devotion to a person, group, or idea.
From 'cult' plus English '-ish' suffix, popularized in the late 20th century. Describes behaviors and attitudes that resemble cult membership without requiring formal cult affiliation.
The suffix '-ish' is brilliant for describing things that *act like* something without *being* that thing—'cultish' lets us notice cult-like behavior in everyday fandoms and obsessions!
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