skinflint

那个吝啬鬼连生日蛋糕都不愿意买一个。

That ___skinflint wouldn't even buy a birthday cake.

那个老守财奴连给孙子买生日蛋糕都舍不得。

The old ___skinflint wouldn't even buy a birthday cake for his grandson.

那个吝啬鬼连给朋友买杯咖啡的钱都不愿意出。

That ___skinflint wouldn't even spend money to buy his friend a cup of coffee.