1) Bad 2) Evil 3) Godless 4) Immoral 5) Impious 6) Iniquitous 7) Peccant 8) Ungodly 9) Unholy 10) Unrighteous 11) Wayward 12) Wicked 1) Characterized by iniquity 2) Decadent 3) Ethically wrong 4) Immoral 5) Iniquitous 6) Irreverent 7) Like decadent desserts 8) Morally corrupt 9) Ungodly 10) Unrighteous 11) Very naughty 12) Wicked 
• (a.) Tainted with, or full of, sin; wicked; iniquitous; criminal; unholy; as, sinful men; sinful thoughts.
Sin'ful adjective [ AAS. synfull .] Tainted with, or full of, sin; wicked; iniquitous; criminal; unholy; as, sinful men; sinful thoughts. Piers Plowman. « Ah sinful nation, a people laden with iniquity.» Isa. i. 4. -- Sin'ful*ly , 
[adj] - having committed unrighteous acts
unholy adjective having committed unrighteous acts; `a sinful person`