If you describe someone as unapproachable, you mean that they seem to be difficult to talk to and not very friendly. approachable. seeming unfriendly and therefore difficult to talk to
{s} not approachable; aloof, reserved, withdrawn; physically inaccessible; unrivaled, unmatchable
inaccessibly located or situated; "an unapproachable chalet high in the mountains"; "an unreachable canyon"; "the unreachable stars"