unbeknownst

adj

1. (not-comparable, with-to)Without the knowledge of.

   “He went home early, unbeknownst to his mother.”

   “Theon’s redemption scene convincingly threatens to kill him right there on the beaches of Dragonstone, dying for a good cause unbeknownst to anyone but the rapscallions who watched him die, but at last it swerves into something genuinely heroic.”