貌不惊人

刺角瓜,虽貌不惊人,但还真的好吃

Horned melon is plain-looking, but actually tastes really good.

他普普通通,平平无奇,貌不惊人,脑子空空

He is very ordinary, unremarkable, plain-looking, and empty-headed.

我出生于平凡的家庭,才不出众,貌不惊人,羡慕神仙颜值的

I was born in an ordinary family, have no outstanding talents, look average, and envy those with god-like beauty.