Usage Note
Inaccessible applies both to physical locations (a mountain peak, a remote area) and to people or concepts that are difficult to reach or understand. It is invariable in gender. The antonym accessible is more common in everyday speech, making inaccessible carry a stronger, more emphatic sense of impossibility.
Examples
"Ce sommet est presque inaccessible en hiver."
Natural Translation
This summit is almost inaccessible in winter.

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