adjective, ruder, rudest.
discourteous or impolite, especially in a deliberate way: a rude reply.
without culture, learning, or refinement: rude, illiterate peasants.
rough in manners or behavior; unmannerly; uncouth.
rough, harsh, or ungentle: rude hands.
roughly wrought, built, or formed; of a crude construction or kind: a rude cottage.
not properly or fully developed; raw; unevolved: a rude first stage of development.
harsh to the ear: rude sounds.
without artistic elegance; of a primitive simplicity: a rude design.
violent or tempestuous, as the waves.
robust, sturdy, or vigorous: rude strength.
approximate or tentative: a rude first calculation of costs.

1300–50; Middle English rude, ruide (< Old French) < Latin rudis

rudely, adverb
rudeness, noun
overrude, adjective
overrudely, adverb
overrudeness, noun
unrude, adjective
unrudely, adverb

1. uncivil, unmannerly, curt, brusque, impertinent, impudent, saucy, pert, fresh. 1, 3. See boorish. 2. unrefined, uncultured, uncivilized, uncouth, coarse, vulgar, rough. 6. See raw. 8. rustic, artless. 9. stormy, fierce, tumultuous, turbulent. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rude (ruːd)
1.  insulting or uncivil; discourteous; impolite: he was rude about her hairstyle
2.  lacking refinement; coarse or uncouth
3.  vulgar or obscene: a rude joke
4.  unexpected and unpleasant: a rude awakening to the facts of economic life
5.  roughly or crudely made: we made a rude shelter on the island
6.  rough or harsh in sound, appearance, or behaviour
7.  humble or lowly
8.  (prenominal) robust or sturdy: in rude health
9.  (prenominal) approximate or imprecise: a rude estimate
[C14: via Old French from Latin rudis coarse, unformed]

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

c.1280, "coarse, rough" (of surfaces), from L. rudis "rough, crude, unlearned," perhaps related to rudus "rubble." Sense of "ill-mannered" is from late 14c. Rudesby "insolent, unmannerly fellow" is from 1566. Rude boy (also rudie, for short) in Jamaican slang is attested from 1967. Fig. phrase rude awakening
is attested from 1895.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Arriving empty-handed without an appointment is the height of rudeness, he
It's easier to disarm rudeness when you've got the facts at your fingertips.
To avoid rudeness, a lift of the eyes or a muttered greeting was necessary.
Rudeness of city employees due to unappreciative public.
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