The quality or state of being greenish; the degree to which something is somewhat green in appearance.
From 'greenish' with the abstract noun suffix '-ness.' This creates a noun describing the quality itself rather than something that is greenish, following English patterns like 'happiness,' 'sadness,' 'blueness.'
Stacking suffixes like this—green + -ish + -ness—shows how English lets us build increasingly abstract concepts from concrete observations: you see something greenish, then describe that greenishness, then theorize about it!
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