coarse

这种沙子太粗糙，不适合做儿童玩具。

This sand is too ___coarse for children's toys.

这把刷子是用坚韧的粗马毛制成的。

This brush is made of tough ___coarse horsehair.

他粗俗的评论让整个会议变得很尴尬。

His ___coarse remarks made the whole meeting awkward.