Not catalyzed; that does not use or require a catalyst(adjective)
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Use "uncatalyzed" in a sentence
"Finally I got fed up with this and pointed out that without a catalytic influence on biochemical reaction x the uncatalyzed version would consume more time than the life expectancy of the organism."
"In vitro evolution of the population of new ribozymes led to improvement of the average ligation activity and the emergence of ribozymes with reaction rates 7 million times faster than the uncatalyzed reaction rate."
"It was initially an uncatalyzed, unrecognizable group of citizens who were shocked that Bush approved TARP."