何なんのことはない

expression

it's nothing; no big deal; not as bad as expected

Used to downplay a situation or outcome, often after an initial worry. Conveys that something turned out to be trivial or not worth concern.

• 心しん配ぱいしていたが、何なんのことはない、簡かん単たんなミスだった。

  I was worried, but it was nothing—just a simple mistake.

• 試し験けんは難むずかしいと思おもったけど、何なんのことはない、普ふ通つうにできた。

  I thought the exam would be hard, but it was no big deal; I managed fine.