on the Q.T.

hidden surreptitious undercover

private privy secret

buried camouflaged cloaked concealed disguised dissembled furtive hush-hush incog incognito masked obscured shrouded stealthy sub-rosa ulterior under wraps under-the-table underhand unsuspected veiled

open

known public revealed unconcealed

aboveboard candid frank honest overt

buried clandestine concealed covered covert dark invisible latent mysterious obscure private secluded underground undisclosed unknown

cloaked close clouded disguised eclipsed masked occult screened sequestered shrouded veiled withheld

abstruse cryptic esoteric hermetic hermetical imperceivable in the dark indiscernible mystic mystical out of view recondite shadowy surreptitious ulterior undercover undetected unexposed unrevealed

aboveboard apparent bare bright clear disclosed exposed known manifest obvious open plain public revealed sociable unconcealed visible

unmasked

exhibited out seen showing uncovered

clandestine concealed crafty crooked cunning deceptive devious dirty-dealing dishonest dishonorable disingenuous double-crossing duplicitous fraudulent furtive guileful hush-hush indirect insidious oblique on the quiet secret secretive shady shifty slippery sly sneaking sneaky stealthy surreptitious treacherous tricky two-faced two-timing under wraps undercover underhanded unethical unfair unjust unscrupulous wily

arcane backdoor classified hush-hush hushed in private inside not for publication not public private privy secret unofficial

exceptional for eyes only inside not for publication off the record privy special top-secret under one's hat

known open public

classified covert furtive hush-hush mysterious obscure private secluded undercover underground undisclosed unknown unpublished

backdoor close closet dark deep mystic occult unseen

abstruse ambiguous arcane camouflaged cloak-and-dagger clouded conspiratorial covered cryptic disguised enigmatical esoteric mystical out-of-the-way recondite reticent retired shrouded strange under wraps unenlightened unfrequented unintelligible veiled

aboveboard apparent honest known obvious open public revealed sociable unconcealed

light visible

clear defined explicit forthright legal legitimate

covert enigmatic reticent taciturn

backstairs buttoned-up cagey clammed up close close-mouthed cryptic feline furtive hushed in chambers in privacy in private in the background in the dark reserved silent tight-lipped undercover unforthcoming withdrawn zipped

communicative

forthright honest open

below ground buried covered covert hush-hush private secret subterrestrial subversive sunken under wraps underfoot

alternative avant-garde clandestine concealed covert experimental hidden hush-hush hypogeal hypogean hypogeous on the sly private radical resistant resistive revolutionary subterranean surreptitious unbowed unconventional under wraps undercover unusual

clandestine covert furtive hush-hush unauthorized

fraudulent hidden hole-and-corner on the sly private skulking slinking sly sneaking stealthy sub-rosa under wraps under-the-table undercover underhand veiled

aboveboard forthright honest open public truthful

authorized

aloof buttoned-up clammed up close close-mouthed curt distant dried-up evasive guarded hush-hush offish quiet reserved reticent retiring secretive short standoffish taciturn tight-lipped unapproachable unresponsive unsociable

communicative confident extroverted responsive

covert

clandestine concealed confidential creep furtive hidden hole-and-corner hush-hush incognito intelligence private stealth stealthy sub-rosa surreptitious under wraps underground underhand underneath

known open public

clandestine experimental hidden private

alternative avant-garde covert radical revolutionary

concealed hush-hush on the sly resistant resistive surreptitious unbowed unconventional under wraps undercover unusual

open

conservative

aboveground authorized condoned ground known legal public sky

underhanded

clandestine concealed crafty crooked cunning deceptive devious dirty-dealing dishonest dishonorable double-crossing duplicitous fraudulent furtive guileful hush-hush indirect insidious oblique on the quiet secret secretive shady shifty slippery sly sneaking sneaky stealthy sub-rosa surreptitious treacherous tricky two-faced two-timing under wraps undercover unethical unfair unjust unscrupulous wily

aboveboard forthright frank honest

clandestinely secretly surreptitiously

by stealth furtively hush-hush in camera in holes and corners on the quiet on the sly privately slyly stealthily sub-rosa under wraps undercover wildcat

candidly frankly honestly openly overtly publicly

behind closed doors behind someone's back by stealth clandestinely confidentially covertly furtively hush-hush in camera in confidence in holes and corners in secret in strict confidence insidiously intimately o obscurely

confidentially privately

between us eyes-only for no other ears in confidence not for publication not to be quoted secretly unofficially within these four walls

clandestinely covertly furtively personally privately quietly stealthily surreptitiously

behind closed doors behind someone's back by stealth confidentially hush-hush in camera in confidence in holes and corners in secret in strict confidence insidiously intimately obscurely on the quiet on the sly privily slyly sub-rosa under the table underhandedly unobserved

publicly

openly

clandestinely covertly furtively secretly slyly surreptitiously