The quality or state of being gushy; excessive sentimentality, enthusiasm, or effusiveness.
From gushy plus abstract noun suffix '-ness' (the quality of), creating a noun that names the quality itself.
The suffix '-ness' is the English language's favorite way to turn feelings and qualities into countable nouns—'kindness,' 'sadness,' 'gushiness'—making abstract emotions into concrete concepts we can discuss.
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