c. 1600, from un- (1) "not" + sociable (adj.). Insociable is older (1580s) but less common.
generally unsociable except with intimate friends
unsociable behavior
an unsociable nature...shy and reserved
an unsociable neighborhood
unsightly
unsinkable
unskilled
unskillful
unsmiling
unsociable
unsold
unsolicited
unsolved
unsophisticated
unsorted
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