effectual

(a) 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 -LewisMumford
- effective teaching methods
- effective steps toward peace
- made an effective entrance
- his complaint proved to be effectual in bringing action
- an efficacious law
effective, efficacious,
(s) having legal efficacy or force
- a sound title to the property
legal, sound,

effective efficacious legal sound

ineffective ineffectual uneffective

effectuality effectually effectualness