Antonyms of adj viewable

1 sense of viewable

Sense 1
viewable -- (capable of being viewed)

INDIRECT (VIA visible) -> invisible, unseeable -- (impossible or nearly impossible to see; imperceptible by the eye; "the invisible man"; "invisible rays"; "an invisible hinge"; "invisible mending")

Similarity of adj viewable

1 sense of viewable

Sense 1
viewable -- (capable of being viewed)
       => visible (vs. invisible), seeable -- (capable of being seen; or open to easy view; "a visible object"; "visible stars"; "mountains visible in the distance"; "a visible change of expression"; "visible files")