inaccessible (adj.)

"not to be reached or approached," early 15c., from Old French inaccessible (14c.), from Late Latin inaccessibilis "unapproachable," from in- "not" (see in- (1)) + accessibilis "approachable" (see accessible). Related: Inaccessibly; inaccessibility. Earlier in same sense was unaccessible (c. 1400).