IPA: /ˌɪnəˈsɛsəbl/
KK: /ɪnˈæsəbl/
Something that cannot be reached or entered easily.
The mountain peak was inaccessible during the winter due to heavy snowfall.
Inaccessible → It is formed from "in-" (meaning not) and "accessibilis" (from Latin, meaning able to be approached or entered). The word "inaccessible" means not able to be approached or entered.
Think of 'not' ('in-') being combined with 'able to be approached' ('accessibilis') — that's why inaccessible means something you cannot reach.