This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. invisible

adj. unimaginable

adj. impossible or nearly impossible to see; imperceptible by the eye

"It stayed this way for hundreds of millions of years -- unseen and unseeable -- until the coming together of clumps of atoms finally spawned the first stars -- enormous boiling nuclear fires, hundreds of times the size of the Sun, and a million times brighter."

lightless    undetectable    out-of-sight    occult    concealed   

46    'qt    unremarked    ungathered    inside