Divide efficacious into syllables: ef-fi-ca-cious Primary syllable stress: ef-fi-ca-cious Secondary syllable stress: ef-fi-ca-cious How to pronounce efficacious: ef-i-key-shus How to say efficacious:
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"efficacious." HowManySyllables.com. How Many Syllables, n.d. Web. 13 December 2024.