retrogressive
adjective
ret·ro·gres·sive
ˌre-trə-ˈgre-siv
: characterized by retrogression: such as
a
: going or directed backward
b
: declining from a better to a worse state
c
: passing from a higher to a lower level of organization
retrogressive evolution
retrogressively
adverb
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Merriam-Webster unabridged
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