Definitions

1. adjective

extremely coarse in texture, quality, or effect

“The coarsest sand on the beach made it difficult to walk.”

2. adverb

most coarsely; in the coarsest manner

“She spoke in her coarsest tone to get the attention of the crowd.”

3. superlative of coarse

having the quality of being coarse in the highest degree

“This is the coarsest fabric I’ve ever seen.”