a. 不爱交际的, 不与人亲近的, 不合群的

[ adj ]
not inclined to society or companionship
<adj.all>
an unsociable nature...shy and reservedgenerally unsociable except with intimate friends
unsociable behavior
an unsociable neighborhood

Unsociable \Un*so"cia*ble\, a.
Not sociable; not inclined to society; averse to
companionship or conversation; solitary; reserved; as, an
unsociable person or temper. -- {Un*so"cia*ble*ness}, n. --
{Un*so"cia*bly}, adv.