这块布料很粗糙，不适合做贴身穿的衣物。

This fabric is the ___coarsest one we have, not suitable for clothes worn next to skin.

他那些最粗俗的言论让整个房间的人都感到尴尬。

His ___coarsest remarks embarrassed everyone in the room.

他用最粗的线条勾勒出轮廓，让画面一目了然。

He outlined the drawing with the ___coarsest lines to make it instantly recognizable.