Ungreen meaning

(of plant or vegetable matter) Decaying.
adjective
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(uncommon) Not green.
adjective
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Environmentally unfriendly; harmful to or inconsiderate of the environment.
adjective
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Origin of ungreen

  • From Middle English ungrene, from Old English ungrēne (“not green”), equivalent to un- +‎ green.

    From Wiktionary