unseeable
1. [ adjective ] impossible or nearly impossible to see; imperceptible by the eye
Synonyms: invisible
Examples:

"the invisible man" "invisible rays" "an invisible hinge" "invisible mending"

Related terms: visible concealed unseen ultraviolet infrared nonvisual camouflaged occult lightless blind imperceptible covert
Similar spelling:   unuseable
  unusable
  unspeakable
  unmixable
  unspeakably
  unchewable
  unexportable