SIN'FULNESS, noun 1. The quality of being sinful or contrary to the divine will; wickedness; iniquity; criminality; as the sinfulness of an action; the sinfulness of thoughts or purposes. 2. Wickedness; corruption; depravity; as the sinfulness of men or of the human race.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI