Difference between Rude and Underbred

RUDE vs UNDERBRED: ADJECTIVE

Lacking education or refinement.
Vigorous or robust.
Unpleasantly forceful or harsh.
In a natural, raw state.
Crude, unfinished, or made with limited skill.
Undeveloped or uncivilized; primitive.
Ill-mannered, discourteous, or insulting.
(of persons) lacking in refinement or grace
Belonging to an early stage of technical development; characterized by simplicity and (often) crudeness
Socially incorrect in behavior
(used especially of commodities) being unprocessed or manufactured using only simple or minimal processes
Hearty, vigorous; found particularly in the phrase rude health.
Lacking civility or good manners
Tough, robust.
Obscene, pornographic, offensive.
Bad mannered.
Not finished or complete; inelegant; lacking chasteness or elegance; not in good taste; unsatisfactory in mode of treatment; -- said of literature, language, style, and the like.
Barbarous; fierce; bloody; impetuous; -- said of war, conflict, and the like; as, the rude shock of armies.
Violent; tumultuous; boisterous; inclement; harsh; severe; -- said of the weather, of storms, and the like.
Of untaught manners; unpolished; of low rank; uncivil; clownish; ignorant; raw; unskillful; -- said of persons, or of conduct, skill, and the like.
Unformed by taste or skill; not nicely finished; not smoothed or polished; -- said especially of material things.
Characterized by roughness; umpolished; raw; lacking delicacy or refinement; coarse.
Undeveloped, unskilled, basic.

Robust; sturdy; rugged; vigorous.
Synonyms Ill-shaped, raw, uncouth, unformed.
7 and Vulgar, loutish, boorish, ill-bred, insolent, surly, churlish, gruff, brusk.
Harsh, inclement, violent, turbulent.
Marked, by incivility; contrary to the requirements of. courtesy: as, rude conduct; a rude remark.
Ill-bred; boorish; uncivil; discourteous; impolite.
Marked by or expressing fierceness or savageness; ferocious, fierce, or cruel in quality.
Having a fierce or cruel disposition; ferocious; sanguinary; savage; brutal.
Barbarous; uncivilized; unpolished; ignorant.
Mean; humble; little known or regarded; hence, as said of persons, low by birth or position.
Lacking cultivation, refinement, or elegance; clumsy; uncouth: as, rude verses; rude art.
Rough; tempestuous; stormy: as, a rude gale; rude weather.
Rudely.
Rough; crude; unwrought; unfashioned; ill-fashioned; without finish or shapeliness: as, a rude mass of material.

Of inferior breeding or manners; vulgar. Not pure-bred or -blooded: as, an underbred horse.

Ill mannered, Lowbred, Bounderish, Underbred, Early, Natural, Unprocessed, Raw, Crude, Primitive, Unrefined, Unmannered, Uncivil, Unmannerly, Impolite

Lowbred, Ill mannered, Ill bred, Bounderish, Early, Natural, Unprocessed, Raw, Crude, Primitive, Unrefined, Unmannered, Uncivil, Unmannerly, Impolite

Some of the comments on here are rude.
During this time her tone became increasingly rude.
They may be rude, anxious, or downright aggressive.
Horrible Experience, other kids were rude and privileged.
For those of you saying its rude its not rude it happens especially if you are a single parent.
The workers were rude on deliver and rude on the times we did carry out!
It may seem rude, but, you need a final head count and if they have not replied, then they are actually the rude ones!
If some customer was rude, you gained nothing by being rude in return and were likely to put off anyone else within earshot.
Telling people they are rude is generally not very useful, as well as being rude itself.
Catcalling and rude remarks and rude noises are a constant at women.

It was, of course, only a bad, underbred habit that showed bad educationand a false idea of good manners.
Her characters are neither underbred nor vicious; with two exceptions, they are simply a rather pleasing variety of pagans.