surreptitious Definition

furtive, covert, sneaky, clandestine, stealthy, secret, sneak, undercover, concealed, skulking, lurking, underground, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, on the quiet, illegal, disguised, hidden, bootleg, irregular, unreported, undocumented, illicit, nefarious, underhanded, unauthorized, secretive, devious, insidious, underhand, sly, conspiratorial, overt, backdoor, unsavory, deceitful, subversive, sinister, unlawful, unwitting, indiscreet, unauthorised, voyeuristic, unsuspecting, contraband, inadvertent, shady, fraudulent, unscrupulous, collusive, dubious, malicious, backstair, in secret, unethical, unknowing, discreet, blatant, obreptitious, unseemly, sleazy, stealthful, shameless, clancular, stealingly, deliberate, brazen, uncandid, ungentlemanly, indecorous, untoward, hasty, crass, indiscrete, circumvention, scandalous, backstairs, tectly, black operation, reprehensible, titillating, subliminal, corruptive, contemptible, clancularly, insidiate, obscene, witting, ritualised, mossad, subtle, snoopy, unwholesome, anticonstitutional, predatory, paranoic, improper, pernicious,