1580s, from un- (1) "not" + skill.
unskilled labor
unskilled in the art of rhetoric
workers in unskilled occupations are finding fewer and fewer job opportunities
unskilled workmanship
an unskilled painting
unsheathe
unshod
unshorn
unsightly
unsinkable
unskilled
unskillful
unsmiling
unsociable
unsold
unsolicited
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