1620s, "unmixed," from un- (1) "not" + sophisticated (adj.). Meaning "ingenuous, natural, inexperienced" is recorded from 1660s.
either too unsophisticated or too honest to promise more than he could deliver
an unsophisticated machine
the nightlife of Montmartre awed the unsophisticated tourists
unsmiling
unsociable
unsold
unsolicited
unsolved
unsophisticated
unsorted
unsought
unsound
unsparing
unspeakable
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