discourteous or impolite, esp. 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.

noun

assumption , audaciousness , audacity , boldness , brashness , brazenness , cheek , cheekiness , chutzpah , discourtesy , disrespect , effrontery , face , familiarity , forwardness , gall , impertinence , impudency , incivility , insolence , nerve , nerviness , overconfidence , pertness , presumptuousness , pushiness , sassiness , sauciness , arrogance , contumely , sass