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Effective vs. Effectual vs. Efficient

effective
Definition

producing or capable of producing an intended result or having a striking effect

Examples

an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation

effectual
Definition

producing or capable of producing an intended result or having a striking effect

Examples

his complaint proved to be effectual in bringing action

efficient
Definition

being effective without wasting time or effort or expense

Examples

an efficient production manager

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