Source : WordNet®

unapproachable
     adj 1: discouraging intimacies; reserved; "an unapproachable
            executive" [ant: {approachable}]
     2: inaccessibly located or situated; "an unapproachable chalet
        high in the mountains"; "an unreachable canyon"; "the
        unreachable stars" [syn: {unreachable}, {unreached}, {out
        of reach(p)}]