surreptitious, clandestine, sly, discreet, quotidian, lascivious, indiscreet, amorous, flirtatious, lustful, sapphic, sub rosa, somnambulistic, grubby, desultory, ritualised, voyeuristic, sinister, affectless, nocturnal, onanistic, importunate, perfunctory, conspiratorial, seedy, solipsistic, hugger mugger, shadowy, covert, shamefaced, overdecorated, crepuscular, stilted, secretive, unembarrassed, schoolmarmish, languorous, companionable, purgatorial, exhibitionistic, decorous, ritualized, sleazy, ritualistic, closeted, vulpine, carnal, banal, disdainful, unseeing, unrepressed, zipless, hushed, orgiastic, rhapsodic, sneaky, illicit, discursive, brusk, obsequious, inscrutable, disreputable, discomfited, unfashionably, sexless, opium den, languid, aimless, indecorous, nerdish, inconspicuous, hermitic, uninhibited, freebooting, supercilious, ghostly, sidelong, undignified, unseemly, unrevealing, coital, moony, convivial, noisome, unprepossessing, uptightness, stealthy, autoerotic, transgressive, libidinous, ratlike, reproachful, verminous, diffident, debauched, amatory, undramatic, insouciant, hemingwayesque, monkish, briefest, frowzy, birdlike, hesitant, menacing, quizzical, timid, ghoulish, irresolute, wistful, boyish, impish, listless, shifty, clumsy

furtively, on the sly, sneak, spying

backstair, backstairs, concealed, covert, lurking, skulking, sneak, sneaky, stealthy, surreptitious