ゆるがせにできない

expression, i-adjective

cannot be ignored; cannot be taken lightly; requires serious attention

Used when something is too important or serious to be dismissed or handled carelessly. Often appears in formal or cautionary contexts.

• この問もん題だいはゆるがせにできない。

  This problem cannot be ignored.

• 安あん全ぜん対たい策さくはゆるがせにできない課か題だいだ。

  Safety measures are an issue that cannot be taken lightly.