[object Object]
The unstressed vowel in the word "poisonous" is the 'i' in the second syllable.
The unstressed vowel in the word "frightening" is the letter "i" in the second syllable "-ten-".
The unstressed vowel in the word "sentence" is the second "e" sound.
An unstressed vowel is a vowel in the word you don't sound.
The unstressed vowel in the word "boundary" is the letter "o" which is pronounced as /ə/ (schwa sound).
An unstressed vowel is a vowel in the word you don't sound.
An unstressed vowel is a vowel in the word you don't sound.
An unstressed vowel is a vowel in the word you don't sound.
An unstressed vowel is a vowel in the word you don't sound.
e
The unstressed vowel in the word "boundary" is the letter "o" which is pronounced as /ə/ (schwa sound).
y
E
The unstressed vowel in the word "sentence" is the second "e" sound.
There are actually two unstressed vowels in the word "similar". The first vowel, "i" is the only stressed vowel. The other two reduce to schwa in speech.
The second letter in each word.
The unstressed vowel in poisonous us the u.