We don't have any synonyms for ungreen yet.
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Definition of ungreen:
(adj) :
Environmentally unfriendly; harmful to or inconsiderate of the environment.
(adj) :
Having little or no vegetation or plant matter.
(adj) :
(uncommon) Not green.
(adj) :
Lacking sap or vitality; desiccated.
(v) :
To urbanize or become less environmentally friendly.
(v) :
(dyeing) To expose to air after dyeing in indigo so that the greenish color fades away.