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Use "unseeable" in a sentence
"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."
"They stood in what seemed to be a plaza between three gigantic pyramids, except that, instead of a plaza, a chasm descended to unseeable depths."
"Rank on rank, the dragon minions stretched into the unseeable distance."