The quality of being appealing; the characteristic of having attractive, interesting, or persuasive power.
From 'appealing' (adjective) plus the suffix '-ness' (forming abstract nouns), creating a noun for the abstract quality itself. This follows the standard English pattern of adjective + -ness → noun.
English speakers add '-ness' to almost any adjective to create new nouns—'appealing' becomes 'appealingness,' 'dark' becomes 'darkness.' It's one of the most productive suffixes in English, letting us create thousands of abstract nouns on the fly.
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