unapproachable

From un- +‎ approachable.

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unapproachable (comparative more unapproachable, superlative most unapproachable)

1. Not accessible or able to be reached.

   Synonym: inaccessible

2. Aloof and unfriendly.

   Synonyms: reserved, standoffish; see also Thesaurus:aloof

3. Without any serious competition; unbeatable.
   • 1859, Charles Dickens, The Haunted House:

     Jack Governor, always a man of wonderful resources, was Chief Cook, and made some of the best dishes I ever ate, including unapproachable curries.

   • 1863, Secrets of My Office, by a Bill Broker, page 313:

     Often, I say, have I wavered in my faith as to the unapproachable beatitude of bachelorism, when dining out, for example, at a well-appointed marital menage.