effectual

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.

Definitions of effectual
  1. adjective
    producing or capable of producing an intended result or having a striking effect
    “his complaint proved to be effectual in bringing action”
    synonyms: effective, efficacious
    hard-hitting, trenchant
    characterized by or full of force and vigor
    impelling
    markedly effective as if by emotional pressure
    impressive, telling
    producing a strong effect
    rough-and-ready
    crude but effective for the purpose at hand
    efficacious
    marked by qualities giving the power to produce an intended effect
    efficient
    being effective without wasting time or effort or expense
    potent, stiff, strong
    having a strong physiological or chemical effect
    powerful
    having great power or force or potency or effect
    useful, utile
    being of use or service
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    Antonyms:
    ineffective, ineffectual, uneffective
    not producing an intended effect
    idle
    not in action or at work
    toothless
    lacking necessary force for effectiveness
    unproductive
    not producing desired results
    inefficacious
    lacking the power to produce a desired effect
    inefficient
    not producing desired results; wasteful
    powerless
    lacking power
    useless
    having no beneficial use or incapable of functioning usefully
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  2. adjective
    having legal efficacy or force
    synonyms: legal, sound
    valid
    well grounded in logic or truth or having legal force
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