This is the 3712th most frequent Japanese word.
かっこいい
Cool; stylish; attractive.
The word 'かっこいい' is used to describe the stylish or appealing nature of the car.
あの車は本当にかっこいいですね。
That car is really cool.
Here, 'かっこいい' refers to the impressive or stylish manner in which the person sings.
彼の歌い方はかっこいいと言えます。
His singing style can be said to be cool.
In this sentence, 'かっこいい' is used to express admiration for the creativity and stylishness of the design.