にしばんもろこしじゃありません
西蛮蜀黍じゃありません
ni shiban morokoshijārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of せいばんもろこし

1. Not a barbarian from the west.; Not a rough/uncouth person.

Negative
Polite
Terminal Form
Usually Written in Kana