Plural of fewnes; archaic plural form referring to multiple instances or types of the quality of being few.
From 'fewnes' (archaic form of 'fewness') plus '-es' (archaic plural suffix). This represents Old English plural formation, where '-es' was added to many nouns—a system that survived in modern English in words like 'houses' and 'churches' but disappeared from most others.
The survival of '-es' plurals in certain words shows how English didn't completely replace its old plural system—we kept it for nouns ending in sibilants, creating a ghostly trace of Old English grammar rules still visible in modern spelling!
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