pessimal

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pessimal

(ˈpɛsɪməl)
adj
(Environmental Science) ecology having conditions that present the lowest chance of survival for a creature
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.pessimal - of an organism's environment; least favorable for survival
worst - (superlative of `bad') most wanting in quality or value or condition; "the worst player on the team"; "the worst weather of the year"