Plural of crudity; instances or examples of crude, vulgar, or unrefined behavior, language, or character.
From 'crudity' (Latin 'cruditas'), which comes from 'crudus' (raw, unrefined); '-ies' is the plural suffix for nouns ending in '-ty'.
When parents complain about their teen's 'crudities,' they mean the rude jokes, bad manners, and unrefined behavior—it's crude because it's not yet mature!
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