Definition of "unimprovable" [unimprovable]

• Not capable of being improved (adjective)

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• "One continuing trend is the industrial look, what Frédéric Winkler, co-founder of trendy lighting company DCW, calls "unimprovable on.""
• "If the class gets assigned to a different teacher the next year that teacher may find himself with an unimprovable class through no fault of hisown."
• "It hit me over the head my recollection is that the moment it did I was in a Vermont field surrounded by friends telling me everything was going to be OK that we live on a lovely, fragile, in certain ways unimprovable planet, edging up on a miracle."