unsubstitutable
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World3 — The World3 model was a computer simulation of interactions between population, industrial growth, food production and limits in the ecosystems of the Earth. It was originally produced and used by a Club of Rome study that produced the model and… … Wikipedia
substitutable — adjective a) Capable of being used as a substitute, valid as a replacement or alternate item. Stevia is not substitutable for sugar in baking, the recipes wont work, they taste terrible. b) Capable of being substituted. Ant: nonsubstitutable,… … Wiktionary
