English word sinful comes from Old English synful (Sinful, guilty, wicked, corrupt.)

Detailed word origin of sinful

Dictionary entry	Language	Definition
synful	Old English (ang)	Sinful, guilty, wicked, corrupt.
sunful	Middle English (enm)
sinful	English (eng)	Constituting a sin; being morally or religiously wrong; wicked; evil.

Words with the same origin as sinful