Plural of fondness; multiple feelings of affection, preference, or liking for something.
From 'fond' plus the noun-forming suffix '-ness' (creating abstract nouns), plus the plural '-es'. The '-ness' suffix is one of the most productive in English for converting adjectives to abstract nouns.
The '-ness' suffix is so reliable that it's essentially an industrial machine for turning adjectives into feelings—kind → kindness, sad → sadness, fond → fondness—which is why it's one of the first suffixes English children learn to use productively.
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