effectual
adjective
1. producing or capable of producing an intended result or having a striking effect
- an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation
- effective teaching methods
- effective steps toward peace
Similar word(s): trenchant, impelling, impressive, telling, efficacious, efficient, potent, stiff, strong, powerful, useful, utile, effective, efficacious
2. having legal efficacy or force