• Webster's Revised Unabridged Dictionary
    • v. t Decivilize To reduce from civilization to a savage state.
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Century Dictionary and Cyclopedia
    • decivilize To reduce or degrade from a civilized to a wilder or more savage state.
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In literature:

But decivilized man is not peculiar to new soil.
"Essays" by Alice Meynell
I've seen planets that decivilized both ways.
"Space Viking" by Henry Beam Piper
Out of the decivilizing forces of war, its tumult and wreckage, there emerges a new quest for truth.
"Mountain Meditations" by L. Lind-af-Hageby
These interferences with open statement and discussion are decivilizing forces.
"New Worlds For Old" by Herbert George Wells