misbecoming

mis·be·come

 (mĭs′bĭ-kŭm′)
tr.v. mis·be·came (-kām′), mis·be·come, mis·be·com·ing, mis·be·comes
To be unsuitable or inappropriate for.
References in classic literature ?
“Stop your grog, indeed!” said Remarkable, rising with great indignation, and seizing a candle; “you’re groggy now, Benjamin and I’ll quit the room before I hear any misbecoming words from you.” The housekeeper retired, with a manner but little less dignified, as she thought, than the air of the heiress, muttering as she drew the door after her, with a noise like the report of a musket, the opprobrious terms of “drunkard,” “sot,” and “ beast.”
"Breeding" is the third of Locke's "good qualities." He first defines it negatively, by characterizing ill breeding as, on the one hand, "sheepish bashfulness" and, on the other, "misbecoming negligence and disrespect" ([section]141, 106).