coarse
adj. B1 Intermediate US //ˈkɔɹs// UK //kˈɔːs// coarse
adj. rough in texture or quality. You use it to describe something that is not smooth, soft, or fine.
adj. having a rough, open, or uneven texture; lacking fineness or delicacy in quality or manner.
The coarse sand scratched my skin.
She preferred the coarse linen sheets because they felt cooler in the summer heat.
His coarse manners offended the guests, who were accustomed to the refined etiquette of the upper class.
Adjectival use of course that diverged in spelling in the 18th century. The sense developed from '(following) the usual course' (cf. of course) to 'ordinary, common' to 'lacking refinement', with 'not fine, granular' arising from its application to cloth. Compare the development of mean.