O-shaped
ambagious
backhanded
circuitous
circular
deviating
deviative
devious
digressive
discursive
excursive
helical
indirect
meandering
oblique
out-of-the-way
rotary
round
roundabout
spiral
aerial
atomic
forward
initial
linear
long-range
magnetic
molecular
planetary
polar
respective
structural
temporal
vertical