unsophisticated not wise in the ways of the world
unstable subject to change; variable
unsubstantiated unsupported by other evidence
unsullied free from blemishes
unsuspecting not knowing or expecting; not thinking likely
untainted (of reputation) free from blemishes
untamed in a natural state; not tamed or domesticated or cultivated
untenable incapable of being defended or justified
unvaried lacking variety
unvarying unvarying in nature

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