unapproachable

un- +‎ approachable

unapproachable (comparative more unapproachable, superlative most unapproachable)

1. Not accessible or able to be reached.
2. Aloof and unfriendly.
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.