How do you pronounce "efficacious"?

In American English: /ˌɛfəˈkeɪʃəs/ (ehf-uh-KAYSH-uhs). In British English: /ˌɛfɪkˈeɪʃəs/ (ehf-ik-AYSH-uhs). In Canadian English: /ˌɛfəˈkeɪʃəs/ (ehf-uh-KAYSH-uhs). In Australian English: /ˌɛfɪkˈeɪʃəs/ (ehf-ik-AYSH-uhs).

Is "efficacious" pronounced differently in American and British English?

Yes. In American English it's pronounced /ˌɛfəˈkeɪʃəs/ (ehf-uh-KAYSH-uhs), while in British English it's /ˌɛfɪkˈeɪʃəs/ (ehf-ik-AYSH-uhs).

How to Pronounce "efficacious"

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efficacious

regional

/ˌɛfəˈkeɪʃəs/

ehf-uh-KAYSH-uhs

Syllable Breakdown

ɛfef·əfi·keɪʃca·əscious

Source

80%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14