Plural of easiness; the quality or state of being easy, simple, or not difficult.
From Middle English 'ease' (comfort, freedom from difficulty) combined with suffix '-ness' (state of being) and plural '-es'. The root traces to Old French 'aise' and likely Frankish origins, entering English around 1200.
This word appears rarely because we usually just say 'ease' for the singular concept, but adding the plural '-es' forces us to confront how awkward it sounds—revealing how English sometimes creates technically valid words that feel unnatural to speakers.
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