artful (adjective)
Synonyms:
insidious, sly, tricky, devious, crafty, wily, dodgy, guileful, insinuating, treacherous.
More subtle synonyms
sensitive, thinly, subtly, delicately, exquisitely, finesse, deft, adroit, dexterous, ingenious, clever, inconspicuous, discreet, unremarkable, sneaky, slick, stealth, gentle, perceptible, visible, discernible, noticeable, fastidious, distinct, legible, unobtrusive, unostentatious, smart, almost imperceptible, hardly visible, hardly noticeable, barely visible, barely perceptible, intricate, audible, mild, indefinable, illusive,