devious

astute, facile, glib, sharp

crooked, deceitful, deceptive, dishonest, fraudulent, insinuating, knavish, Machiavellian, oblique, serpentine, shady, shifty, slippery, sneaky, treacherous, underhand, underhanded, unscrupulous

backhanded, double-dealing, hypocritical, insincere, left-handed, mealy, mealymouthed, smooth-tongued, two-faced

circuitous, circular, roundabout

clandestine, concealed, covert, furtive, hugger-mugger, secret, stealthy, surreptitious, undercover

calculating, plotting

zigzag, zigzagging

circling, coiled, coiling, corkscrew, looping, spiral, spiraling (or spiralling), swirling

circuitous, indirect, roundabout

meandering, rambling, wandering

irregular, jagged, uneven