しんぱいごむよう
don't worry about it; there is nothing to fear; there is no need for anxiety; everything is under control
Also written 心配御無用
Expression
心配しんぱいご無用むよう！
Don't worry!
心配しんぱいご無用むよう。楽勝らくしょうです。
Don't worry. It's a piece of cake.
心配しんぱいご無用むよう。すべて想定内そうていないです。
Don't worry. Everything's under control.