no fair

childish

(childish) That is not fair; a protest against unjust behaviour

Japanese Meaning

不公平だ！（不正な扱いに対する抗議の叫び） / そんなのは不当だ！（子供じみた怒りや抗議を表す）

I shouted no fair when my brother hid the TV remote.

兄がテレビのリモコンを隠したとき、私は思わず「ずるい！」と叫んだ。

Sense（1）

(childish) That is not fair; a protest against unjust behaviour

What? That was my tadpole. No fair!