recondite (adj.)

1640s, "removed or hidden from view," from Old French recondit, from Latin reconditus, past participle of recondere "store away, hide, conceal, put back again, put up again, lay up," from assimilated form of com- "together" (see com-) + -dere "put," from PIE root *dhe- "to set, put, place." Meaning "removed from ordinary understanding, profound" is from 1650s; of writers or sources, "obscure," it is recorded from 1817.