Antonyms of adj reachable

1 sense of reachable

Sense 1
approachable, reachable -- (easily approached; "a site approachable from a branch of the Niger")

INDIRECT (VIA accessible) -> inaccessible, unaccessible -- (capable of being reached only with great difficulty or not at all)

Similarity of adj reachable

1 sense of reachable

Sense 1
approachable, reachable -- (easily approached; "a site approachable from a branch of the Niger")
       => accessible (vs. inaccessible) -- (capable of being reached; "a town accessible by rail")