Words that Rhyme with efficacious
2 Syllable Words
gracious, spacious
3 Syllable Words
audacious, capacious, ceraceous, fallacious, flirtatious, hellacious, herbaceous, horatius, ignatius, loquacious, predaceous, salacious, sebaceous, tenacious, vexatious, vivacious, voracious
4 Syllable Words
ostentatious
Definition of efficacious
n. Possessing the quality of being effective; productive of, or powerful to produce, the effect intended; as, an efficacious law.