It's not safe to wave your scissors in the air like that.
Don't swing your scissors around other people. It's dangerous.
ーIt's not safe to wave your scissors in the air like that.
「そんな風にハサミを振り回すのは安全じゃないよ。」=「危ないよ」のように言えます。
wave ... in the air で「…を振り回す」
ーDon't swing your scissors around other people. It's dangerous.
「人の周りでハサミを振り回したらダメ。危ないよ。」
swing ... around でも「…を振り回す」と言えます。
ご参考まで!