Behavior or actions that are strange, wild, or unconventional; the quality or practice of being a freak.
From 'freak' plus the suffix '-ery' (from Old French '-erie', meaning condition, practice, or behavior). This suffix creates nouns describing what people do or how they act.
The suffix '-ery' is a verb-maker's best friend—it turns adjectives and nouns into whole practices and behaviors, as in 'bravery,' 'trickery,' and 'tomfoolery,' allowing us to name entire patterns of human weirdness.
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