It is not entirely clear whether you are asking which syllable is stressed or what the first syllable is. The stressed syllable is the first syllable: sev.
The stressed syllable in the word "several" is the first syllable, "sev-".
The first syllable "sev" is stressed in the word "several."
The first.
The first.
Footprint is stressed on the first syllable.
Captive is stressed on the first syllable.
The first syllable in "dangerous" is stressed.
In the word "lawyer," the first syllable "law" is stressed.
District is stressed on the first syllable.
Saunter is stressed on the first syllable.
Accurate is stressed on the first syllable.
The stressed syllable in "injure" is the first syllable "in-".