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efficaciousfactious, fractious •anxious • captious •precious, semi-precious •infectious •conscientious, contentious, licentious, pretentious, sententious, tendentious •Athanasius, audacious, bodacious, cactaceous, capacious, carbonaceous, contumacious, Cretaceous, curvaceous, disputatious, edacious, efficacious, fallacious, farinaceous, flirtatious, foliaceous, fugacious, gracious, hellacious, herbaceous, Ignatius, loquacious, mendacious, mordacious, ostentatious, perspicacious, pertinacious, pugnacious, rapacious, sagacious, salacious, saponaceous, sebaceous, sequacious, setaceous, spacious, tenacious, veracious, vexatious, vivacious, voracious •facetious, Lucretius, specious •adventitious, Aloysius, ambitious, auspicious, avaricious, capricious, conspicuous, delicious, expeditious, factitious, fictitious, flagitious, judicious, lubricious, malicious, Mauritius, meretricious, nutritious, officious, pernicious, propitious, repetitious, seditious, siliceous, superstitious, suppositious, surreptitious, suspicious, vicious •noxious, obnoxious •conscious, subconscious, unselfconscious •cautious, tortious •atrocious, ferocious, precocious •Confucius • luscious •bumptious, scrumptious •compunctious, rambunctious

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ef·fi·ca·cious / ˌefiˈkāshəs/ • adj. formal (typically of something inanimate or abstract) successful in producing a desired or intended result; effective: the vaccine has proved both efficacious and safe. DERIVATIVES: ef·fi·ca·cious·ly adv. ef·fi·ca·cious·ness n.

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efficacious XVI. f. L. efficāx, -āc, f. efficere; see EFFECT, -ACIOUS.
So efficacity XV. — F. — L. efficient making a thing what it is XIV; adequately operative or skilled XVIII. —prp. of L. efficere. efficiency XVI.