What is the unstressed vowel in word boundary?

The unstressed vowel in the word "boundary" is the "a" in the first syllable.

Here's why:

* Stress: The word "boundary" has stress on the second syllable ("oun").

* Unstressed Vowel: The first syllable ("bound") is unstressed.

* Schwa: The "a" in "bound" is pronounced with a schwa sound, which is a very common unstressed vowel sound in English.

Let me know if you have any other words you'd like to analyze!