unexplained

anonymous exotic foreign nameless new remote strange uncharted undiscovered unexplored unfamiliar unidentified unnamed unrecognized

X alien dark far secret

concealed desolate distant far-off faraway hidden humble incog incognito little-known such and such unapprehended unascertained uncelebrated undistinguished unheard-of unnoted unperceived unrenowned unrevealed unsung untold

common familiar identified known named native normal regular relevant usual