circular

[1]	handbill , bill , broadside , broadsheet , flier , flyer , throwaway

adj.

[1]	round , disc-shaped/(Mainly US) disk-shaped , disc-like/(Mainly US) disk-like , discoid , ring-shaped , ring-like , annular
[2]	roundabout , round , indirect , circuitous , tortuous , twisting , twisted , anfractuous , periphrastic , circumlocutory , devious
[3]	illogical , rotary , orbitual , inconsistent , redundant , fallacious , irrational , (Formal) sophistic/sophistical