SIN'FUL, adjective [from sin.] 1. Tainted with sin; wicked; iniquitous; criminal; unholy; as sinful men. Ah, sinful nation, a people laden with iniquity! Isaiah 1:4. 2. Containing sin, or consisting in sin; contrary to the laws of God; as sinful actions; sinful thoughts; sinful words.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI