1580s, of places, from un- (1) "not" + approachable. Of persons, "distant, aloof," attested from 1848. Related: Unapproachably.
an unapproachable chalet high in the mountains
an unapproachable executive
unapologetic
unappeasable
unappreciated
unappreciative
unapprehended
unapproachable
unapproved
unarmed
unary
unashamed
unasked
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