Effectual

EFFECT'UAL, adjective Producing an effect, or the effect desired or intended; or having adequate power or force to produce the effect. The means employed were effectual

According to the gift of the grace of God given me by the effectual working of his power. [[Ephesians 3#7|Ephesians 3:7]].

1. Veracious; expressive of facts. [Not used.]

2. effectual assassin, in Mitford, is unusual and not well authorized.