とっさじゃありません
咄嗟じゃありません
tossajārimasen

Noun
Desu Copula
no-Adjective
Negation Auxiliary

The polite negative form of とっさ

1. It is not impromptu.; It is not offhand.; It is not on the spur of the moment.

Negative
Polite
Terminal Form
Usually Written in Kana