ill-mannered, inadvisable, off-colour, impertinent, abrasive, gauche, uncultured, imprudent, undiplomatic, brash, discourteous, unpolitic, impolitic, uncouth, immodest, injudicious, churlish, maladroit, untactful, bawdy, uncomely, naughty, impolite, uncivilized, courtesy, impudent, smart, ribald, usual, in poor taste, unwise, unbefitting, ability, uncultivated, barbarian, ill-advised, insolent, smooth, off-color
improper (part of speech: adjective)
vulgar (part of speech: adjective)
earthy, crude, scandalous, profane, cheap, degraded, obscene, gaudy, common, depraved, barnyard, salty, gross, unpolished, tactless, sordid, revolting, low, homespun, animal, outlandish, colloquial, sleazy, unbecoming, base, rank, boorish, ignoble, undignified, rude, cockney, repulsive, raw, crass, glaring, tasteless, coarse, inelegant, ignominious, tawdry, unrefined, barbaric, brazen, shameless, graceless, clumsy, unseemly, in bad taste, ill-bred, chintzy, coarse-grained, rough, philistine, brutish, offensive, vulgar, idiomatic, garish, broad
- Foragers thought it not indelicate to linger about the house of the unsuspecting farmer till the lamp revealed the family at supper, and then modestly approach and knock at the door. - "Detailed Minutiae of Soldier life in the Army of Northern Virginia, 1861-1865", Carlton McCarthy.
- Fathers, mothers, guardians and husbands fancy to yourself the most indelicate, immodest, libidinous questions which the most immoral and profligate mind can conceive,- fancy those ideas put into plain language, and that by way of questions and answers, and you will then have a faint conception of the conversation which takes place between a priest and your hitheto pure daughter. - "Monks, Popes, and their Political Intrigues", John Alberger.
- Fully aware of the end which she in her own mind proposed to our acquaintance, my long conversation with the merchant struck her as an indelicate readiness to accept attentions which had matrimony in her perspective, and which she had designed to be the gradual result of sundry well- chaperoned and studiously incidental interviews at the Cottage. - "Mrs. Overtheway's Remembrances", Juliana Horatia Ewing.