でたらめでわありません
出鱈目ではありません
detaramedewārimasen

Noun
Desu Copula
na-Adjective
Negation Auxiliary

The polite negative form of でたらめ

1. It is not nonsense.; It is not arbitrary.; It is not groundless.

Negative
Polite
Formal Register
Usually Written in Kana