insociable
Adjective
Meaning
Incapable of being associated, joined, or connected.
Not sociable or companionable; disinclined to social intercourse or conversation; unsociable; taciturn.
Source: Webster's dictionarySynonyms
formal
cold
remote
distant
modest
withdrawn
solitary
retiring
self-contained
arrogant
unfriendly
taciturn
standoff
unapproachable
offish
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