slippery

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

cagey (also cagy), shifty

ephemeral, evanescent, fleeting, impermanent, momentary, passing, short-lived, temporary, transient, transitory

inaccessible, inconvenient, unapproachable, unattainable, unavailable, unobtainable, unreachable, untouchable

brushed, buffed, burnished, glossed, ground, polished, rubbed, shined

coated, glazed, waxed

soapy, waxy

rasped, sandblasted, sanded, sandpapered, scoured, scraped, scrubbed