How to pronounce reasonable in American English
Americans pronounce reasonable as REE-zuh-nuh-buhl (/ˈrizənəbəl/). The unstressed syllable reduces to a lazy schwa — almost a quick "uh" — instead of being pronounced fully. Stress falls on the first syllable — keep everything else short and quick.
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Why "reasonable" sounds like REE·zuh·nuh·buhl.
In "reasonable", the short unstressed vowel before "" disappears — the schwa is absorbed and the "" becomes the syllable nucleus on its own. This is called the Silent Schwa Before L/M/N/R, a hallmark of natural-sounding American speech. It comes out as REE·zuh·nuh·buhl.
Hear "reasonable" in the wild.
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Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
Treating every L the same.
The L in "reasonable" is a dark L — the back of the tongue rises toward the soft palate, adding a small "uh" quality before the L. Dark L adds a small schwa-like "uh" before the L. The back of the tongue lifts toward the soft palate.
Inserting a vowel before the syllabic consonant.
In "reasonable", the short unstressed vowel before "" disappears — the schwa is absorbed and the "" becomes the syllable nucleus on its own. Schwa is absorbed — consonant becomes the syllable nucleus.
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch REE — keep everything else short and quick.
Pronouncing the unstressed syllable too fully.
Don't pronounce the first syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.