Thick; large or gross in bulk; comparatively of large diameter; as coarse thread or yarn; coarse hair; coarse sand. This seems to be the primary sense of the word; opposed to fine or slender. Hence,

Thick; rough; or made of coarse thread or yarn; as coarse cloth.

Not refined; not separated from grosser particles, or impurities; as coarse metal; coarse glass.

Rude; rough; unrefined; uncivil; as coarse manners.

Gross; not delicate. The coarser tie of human law.

Rude; rough; unpolished; inelegant; applied to language.

Not nicely expert; not accomplished by art or education; as a coarse practitioner.

Mean; not nice; not refined or elegant; as a coarse perfume; a coarse diet.