different between unneighbourly vs unapproachable

English

un- +? neighbourly

unneighbourly (comparative more unneighbourly, superlative most unneighbourly)

unneighbourly (comparative more unneighbourly, superlative most unneighbourly)

un- +? approachable

unapproachable (comparative more unapproachable, superlative most unapproachable)

Not accessible or able to be reached.
Synonym: inaccessible
Aloof and unfriendly.
Without any serious competition; unbeatable.
- 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.

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