有益 ゆうえき無害 むがいじゃありませんでした
yūeki mugaijārimasendeshita

Noun
Desu Copula
na-Adjective

The polite, past negative form of 有益無害

1. Was not beneficial or harmless.; Was not without benefit or harm.

Past/Perfective
Negative
Polite
Terminal Form