無用(むよう)useless, futile, unnecessary, needless, not on business, unrelated, unauthorised, unauthorized, prohibited, banned, forbidden

教室(きょうしつ)の中(なか)では銃(じゅう)は無用(むよう)だ。

Guns are useless in the classroom. {useless, futile, unnecessary, needless, not on business, unrelated, unauthorised, unauthorized, prohibited, banned, forbidden}

釣(つ)った魚(さかな)から無用(むよう)な臓器(ぞうき)を取(と)り出(だ)す。

Remove the unnecessary organs from the fish that was caught. {useless, futile, unnecessary, needless, not on business, unrelated, unauthorised, unauthorized, prohibited, banned, forbidden}

義母(ぎぼ)：「この家(いえ)では遠慮(えんりょ)は無用(むよう)です。寛(くつろ)いで下(くだ)さい。」

Mother-in-law: 'There's no need for restraint in this house. Please make yourself comfortable.' {useless, futile, unnecessary, needless, not on business, unrelated, unauthorised, unauthorized, prohibited, banned, forbidden}

張(は)り紙(がみ)：「無用(むよう)の者(もの)は、マンションの敷地(しきち)内(ない)に入(はい)ってはならぬ。」

Poster: 'Those who are not needed must not enter the premises of the apartment building.' {useless, futile, unnecessary, needless, not on business, unrelated, unauthorised, unauthorized, prohibited, banned, forbidden}

この部屋(へや)はそんなに広(ひろ)くないから無用(むよう)のものはこまめに捨(す)てねばならない。

Since this room is not that spacious, we must regularly throw away unnecessary items. {useless, futile, unnecessary, needless, not on business, unrelated, unauthorised, unauthorized, prohibited, banned, forbidden}