not appropriate for a purpose or occasion; " unsuitable attire for the office"; " said all the wrong things"

not suitable or right or appropriate; " slightly improper to dine alone with a married man"; " improper medication"

Not proper; not suitable; not fitted to the circumstances, design, or end; unfit; not becoming; incongruous; inappropriate; indecent; as, an improper medicine; improper thought, behavior, language, dress.

Not peculiar or appropriate to individuals; general; common.

Not according to facts; inaccurate; erroneous.

To appropriate; to limit.

Not well adapted or suited to the purpose; not according to usage; wrong; unseemly; unbecoming; indecent; in mathematics, indicating a fraction in which the numerator is greater than the denominator.

Improperly.

Not suitable: unfit: unbecoming: incorrect: wrong.

Not becoming; unsuitable.

Not proper; unsuitable.

Not suitable; not adapted to its end; not becoming; not decent.

But it would appear highly improper for such a little boy as you to take upon him to instruct others, while he all the time wants so much instruction himself. – The History of Sandford and Merton by Thomas Day

Hot crank pins may occur from several causes, but by far the most common ones are from improper oiling, or from the engine being out of line. – Modern Machine-Shop Practice, Volumes I and II by Joshua Rose

She's going to ask her father to come, too- says it would be terribly improper for us two to ride alone. – The Gringos by B. M. Bower

Strength is never greater than when used rightly; never greater than when refused to the improper use. – Quiet Talks about Jesus by S. D. Gordon

2. What is an Improper Title? – Writing for Vaudeville by Brett Page

When, however, Andromeda too grew up, the wily Anthony feared his fruitful friendship must inevitably come to an end, since the only remaining daughter had already reached the dangerous age of fifteen, and bore moreover the improper name of Anactoria! – Modern marriage and how to bear it by Maud Churton Braby

This was long before we had any empire or pretence to empire in that part of India: therefore the expression of a rebellion, which he had used with regard to her, was, he acknowledged, improper, and that he only meant he had formed some opinion of her disaffection to the English. – The Works of the Right Honourable Edmund Burke, Vol. XII. (of XII.) by Edmund Burke

" Most improper of the postman," replies Mr. Massereene, soothingly. – Molly Bawn by Margaret Wolfe Hamilton

But I am sensible that there remain two points on which it would be improper to be silent. – The Works of Robert Louis Stevenson - Swanston Edition Vol. 17 (of 25) by Robert Louis Stevenson Other: Andrew Lang

What's an improper word? – Nine Little Goslings by Susan Coolidge

Of course from this very hour you will cease the highly improper and ungenteel business which you have pursued. – Old Fritz and the New Era by Louise Muhlbach

Most of his stories were very improper, but their wit excused them. – The Reminiscences of an Irish Land Agent by S.M. Hussey

Doctor Svetilovitch thought he ought to protest against the improper actions of the police. – The Created Legend by Feodor Sologub

I look upon her as a most improper companion for you; and the sooner you are separated from her the better. – Marriage by Susan Edmonstone Ferrier

Besides, she possesses the dangerous art of exciting an improper idea, without using an improper word. – Coelebs In Search of a Wife by Hannah More

A lack of proper knowledge of selection of fish for the different methods of cooking, and the improper cooking of fish once it is acquired, are responsible to a large extent for the prejudice so frequently to be found against the use of fish. – Foods That Will Win The War And How To Cook Them (1918) by C. Houston Goudiss and Alberta M. Goudiss

It is most improper, I may say dangerous, to admit such a number at once. – Marriage à la mode by Mrs. Humphry Ward

There are things which she thinks right that seem to me quite out of place and improper." – Ester Ried by Pansy (aka. Isabella M. Alden)

I consider it my duty to prevent you from making an improper match; and, as his Majesty's representative here, I cannot allow you to marry this young man. – Mr. Midshipman Easy by Captain Frederick Marryat

Compare proper, appropriate, improper. – Stories from Tagore by Rabindranath Tagore