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

unrepresentative

extraordinary, preternatural

rare, uncommon, uncustomary, unusual, unwonted

bizarre, curious, far-out, funny, kinky, odd, outlandish, out-of-the-way, outré, peculiar, quaint, queer, queerish, quirky, remarkable, screwy, strange, wacky (also whacky), way-out, weird, wild

eccentric, freakish, idiosyncratic, nonconformist, unconventional, unorthodox

extraordinary, preternatural

rare, uncommon, uncustomary, unusual, unwonted

odd, peculiar, strange