shady

canopied, covered, sheltered

cloudy

dark, darkened, darkish, darkling, darksome, dim, dimmed, dusky, gloomy, inky, moonless, murky, obscure, obscured, penumbral, pitch-black, pitch-dark, somber (or sombre), sunless

unconscionable, unethical, unprincipled, unscrupulous

deceitful, deceiving, deluding, delusive, delusory, false

artful, beguiling, cagey (also cagy), crafty, cunning, foxy, slick, sly, subtle, wily

defrauding, devious, furtive, slippery, sneaking, sneaky, trickish, tricky

insidious, perfidious, treacherous

alleged, so-called, supposed

moot

ambiguous, open, unclear

uncertain, undecided, undetermined

far-fetched, flimsy, improbable, unlikely, weak

artful, crafty, cunning, devious, foxy, guileful, slick, wily

close, closemouthed, reticent, secretive

clandestine, covert, dark

deceitful, deceiving, deceptive, devious, duplicitous, trickish, tricky, underhand, underhanded

cheating, crooked, defrauding, dishonest, dissembling, double-dealing, knavish, two-faced

lying, mendacious, untrustworthy, untruthful

insidious, perfidious, serpentine, treacherous

bad, criminal, immoral, seamy, sordid, unethical, unsavory, wicked

base, contemptible, despicable, detestable, dirty, low, mean, miserable, vile, wretched

black, evil, iniquitous, nefarious, rotten, sinful, unrighteous, vicious, villainous, wrong

corrupt, debased, debauched, degenerate, depraved, dissolute, gamy (or gamey), libertine, loose, perverted, reprobate