This is the 9491st most frequent Japanese word.
粗
"粗" means "coarse," "rough," or "crude."
Here, '粗' is used to denote a deficiency or imperfection in the product.
この製品の粗を見つけました。
I found a flaw in this product.
In this sentence, '粗' contributes to the adjective '粗野', which means rough or crude in behavior or attitude.
彼は粗野な態度で話しかけた。
He spoke with a crude attitude.
The word '粗' here is part of the adjective '粗い', referring to a texture that is rough or not refined.