How do you pronounce "fastest"?

In American English: /ˈfæstəst/ (FAST-uhst). In British English: /fˈɑːstɪst/ (F-ahst). In Canadian English: /ˈfæstəst/ (FAST-uhst). In Australian English: /fˈastɪst/ (F).

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

Yes. In American English it's pronounced /ˈfæstəst/ (FAST-uhst), while in British English it's /fˈɑːstɪst/ (F-ahst).

How to Pronounce "fastest"

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fastest

regional

/ˈfæstəst/

FAST-uhst

Syllable Breakdown

fæstfas·əsttest

Source

90%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14