unapproachable
US /ˌʌn.əˈproʊ.tʃə.bəl/
UK /ˌʌn.əˈproʊ.tʃə.bəl/
1.
近寄りがたい
Someone who is unapproachable seems unfriendly or a little frightening, so that other people are less likely to speak to them:
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As a boss I found him rather unapproachable.