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Use "unfathomed" in a sentence
"Clearly he is throwing up obstacles to solutions, for some unfathomed reason (s)."
"With blinded, tear-filled eyes she peered into that formless black and burning face and sensed in its soft, sad gleam unfathomed understanding."
"Two fiddles sang out in unison—a wild, hectic reel—and it was as if a puzzle box was opening itself before his eyes, each note a key to an unfathomed existence."