Effectual means good at achieving the results you want. The most effectual method for avoiding cavities? Brush, floss, lay off the candy, and see your dentist every 6 months.
Wait, aren't effectual and effective basically the same adjectives with the same meaning? Well, generally speaking, yes. But if you want to get really nit-picky, you might note that effectual actually describes something that produces the desired result, but in a big way. Effective simply gets the job done. No one is going to call you out for using either word interchangeably though, as long as it's done effectually.
adj producing or capable of producing an intended result or having a striking effect
characterized by or full of force and vigor
markedly effective as if by emotional pressure
producing a strong effect
crude but effective for the purpose at hand
marked by qualities giving the power to produce an intended effect
being effective without wasting time or effort or expense
potent, stiff, strong
having a strong physiological or chemical effect
having great power or force or potency or effect
being of use or service
ineffective, ineffectual, uneffective
not producing an intended effect
not in action or at work
lacking necessary force for effectiveness
not producing desired results
lacking the power to produce a desired effect
not producing desired results; wasteful
having no beneficial use or incapable of functioning usefully
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