[kawrs, kohrs]
adjective, coarser, coarsest.
composed of relatively large parts or particles: The beach had rough, coarse sand.
lacking in fineness or delicacy of texture, structure, etc.: The stiff, coarse fabric irritated her skin.
harsh; grating.
lacking delicacy, taste, or refinement; unpolished: He had coarse manners but an absolutely first-rate mind.
of inferior or faulty quality; common; base.
vulgar; obscene; crude: His coarse language angered us.
(of metals) unrefined.
(of a metal file) having the maximum commercial grade of coarseness.

1550–60; earlier cors(e), course, cowarce; of obscure origin

coarsely, adverb
coarseness, noun
uncoarse, adjective
uncoarsely, adverb
uncoarseness, noun

coarse, course, curse, cuss.

2, 4. crude, rude, rough. 4. vulgar, gross, crass. 6. indelicate.

4. refined, sensitive. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coarse (kɔːs)
1.  rough in texture, structure, etc; not fine: coarse sand
2.  lacking refinement or taste; indelicate; vulgar: coarse jokes
3.  of inferior quality; not pure or choice
4.  (of a metal) not refined
5.  (of a screw) having widely spaced threads
[C14: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1424, cors "ordinary," probably adj. use of noun cours (see course), originally referring to rough cloth for ordinary wear. Developed a sense of "rude" c.1510 and "obscene" 1711. Perhaps related, via metathesis, to Fr. gros, which had a similar sense development.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Coarse and fine image adjustments in both vertical and horizontal directions.
It's coarse and rough and irritating and it gets everywhere.
Add it before beating the whites into a coarse foam.
People dip their potatoes in coarse salt and edible clay.
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