Plural form; could refer to frenetic behaviors or a plural usage of the adjective when used nominally, though this is rare.
Created by adding the standard English plural suffix -s to frenetic when used as a noun, though the word is predominantly used as an adjective or adverb rather than a noun.
This word is actually quite uncommon because 'frenetic' rarely functions as a countable noun—but it shows how flexible English is, allowing us to pluralize almost any word if we need to discuss multiple instances of frenetic behavior.
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