The quality or state of being beeish; the characteristic of resembling or acting like a bee in terms of industriousness.
From 'beeish' plus the suffix '-ness,' which forms abstract nouns. This doubly-derived word (bee + -ish + -ness) represents a typical pattern in English for creating qualities from adjectives.
This is a rare example of 'stacking' suffixes in English—we take a noun (bee), make it an adjective (beeish), then convert that to an abstract quality (beeishness)—it's like verbal nesting dolls!
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