adj.秘密的，隐蔽的,
Merriam-Webster Online Dictionary
covert (adjective)1.
not openly shown, engaged in, or avowed - veiled a covert alliance
2.
over - covered sheltered secret
1.
a) hiding place - shelter
b) a thicket affording for game - cover
c) a masking or concealing device
2.
a feather the bases of the quills of the wings and tail of a bird - covering see wing illustration
3.
a firm durable twilled sometimes waterproofed cloth usually of mixed-color yarns
Merriam-Webster Online Thesaurus
covert (adjective)1.
screened or sequestered from view
SYNONYMS:
cloistered, covert, hidden, isolated, quiet, remote, retired, secret, shelteredRELATED WORDS:
lone, lonely, lonesome, reclusive, solitary; privateNEAR ANTONYMS:
obvious, visible; exposed2.
undertaken or done so as to escape being observed or known by others
SYNONYMS:
backstairs, behind-the-scenes, clandestine, covert, furtive, hole-and-corner, hugger-mugger, hush-hush, private, privy, sneak, sneaking, sneaky, stealth, stealthy, surreptitious, undercover, underground, underhand, underhandedRELATED WORDS:
back-channel, closed-door, off-the-books, off-the-record; classified, confidential, restricted, top secret, undisclosed; concealed, hidden, secreted, subterranean, unadvertised, unexposedNEAR ANTONYMS:
acknowledged, avowed; aboveboard, straightforward, unconcealed, undisguised; unclassified, unrestricted; clear, evident, manifest, obvious, patent, plain1.
a place where a person goes to hide or to avoid others
SYNONYMS:
concealment, covert, den, hermitage, hideaway, hidey-hole ( hidy-hole), lair, nestRELATED WORDS:
blind, cover, nook, recess; hangout, harbor, harborage, haunt, haven, redoubt, refuge, retreat, shelter2.
a thick patch of shrubbery, small trees, or underbrush
SYNONYMS:
boscage ( boskage), bosk ( bosque), bosquet, brake, brushwood, chaparral, coppice, copse, covertRELATED WORDS:
canebrake; brush, bush, scrub, scrubland; bramble, jungle, tangle; grove, hedge, stand, woodlot; forest, greenwood, wildwood, wood, woodland