covert

covert

adjective clandestine, cloaked, concealed, covered, cryptic, cryptical, dark, delitescent, disguised, furtive, hidden, insidious, invisible, latent, muffled, mystic, mystical, nonapparent, occult, out of sight, private, screened, secluded, secret, sheltered, shrouded, sly, sneaky, stealthy, surreptitious, tacit, undercover, underhand, undisclosed, unknown, unobtrusive, unseen, unsuspected, veiled

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See also: allusive, asylum, blind, clandestine, concealed, confidential, esoteric, evasive, furtive, hidden, impalpable, inconspicuous, indirect, latent, mysterious, personal, potential, private, privy, protection, recondite, refuge, secret, shield, sly, stealthy, surreptitious, undisclosed, unobtrusive

COVERT, BARON. A wife; so called, from her being under the cover or protection of her husband, baron or lord.