IMPROPER Synonyms: 120 Similar and Opposite Words

Q: How does the adjective 'improper' differ from other similar words?

Some common synonyms of improper are indecorous , indelicate , unbecoming , and unseemly . While all these words mean "not conforming to what is accepted as right, fitting, or in good taste," improper applies to a broader range of transgressions of rules not only of social behavior but of ethical practice or logical procedure or prescribed method. // improper use of campaign contributions

Q: When would 'indecorous' be a good substitute for 'improper'?

The synonyms indecorous and improper are sometimes interchangeable, but indecorous suggests a violation of accepted standards of good manners. // indecorous behavior

Q: When is 'indelicate' a more appropriate choice than 'improper'?

The words indelicate and improper can be used in similar contexts, but indelicate implies a lack of modesty or of tact or of refined perception of feeling. // indelicate expressions for bodily functions

Q: In what contexts can 'unbecoming' take the place of 'improper'?

While in some cases nearly identical to improper , unbecoming suggests behavior or language that does not suit one's character or status. // conduct unbecoming to an officer

Q: When could 'unseemly' be used to replace 'improper'?

The words unseemly and improper are synonyms, but do differ in nuance. Specifically, unseemly adds a suggestion of special inappropriateness to a situation or an offensiveness to good taste. // remarried with unseemly haste

improper

adjective

(ˌ)im-ˈprä-pər

Definition of improper

as in inappropriate

not appropriate for a particular occasion or situation an improper use of slang in a formal piece of writing

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Synonym Chooser

How does the adjective improper differ from other similar words?

Some common synonyms of improper are indecorous, indelicate, unbecoming, and unseemly. While all these words mean "not conforming to what is accepted as right, fitting, or in good taste," improper applies to a broader range of transgressions of rules not only of social behavior but of ethical practice or logical procedure or prescribed method.

improper use of campaign contributions

When would indecorous be a good substitute for improper?

The synonyms indecorous and improper are sometimes interchangeable, but indecorous suggests a violation of accepted standards of good manners.

indecorous behavior

When is indelicate a more appropriate choice than improper?

The words indelicate and improper can be used in similar contexts, but indelicate implies a lack of modesty or of tact or of refined perception of feeling.

indelicate expressions for bodily functions

In what contexts can unbecoming take the place of improper?

While in some cases nearly identical to improper, unbecoming suggests behavior or language that does not suit one's character or status.

conduct unbecoming to an officer

When could unseemly be used to replace improper?

The words unseemly and improper are synonyms, but do differ in nuance. Specifically, unseemly adds a suggestion of special inappropriateness to a situation or an offensiveness to good taste.

remarried with unseemly haste

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of improper American Home Shield covers unknown preexisting conditions and improper installations. — Alora Bopray, USA Today, 21 Aug. 2026 The scale of the potentially improper loans could be quite significant, with some reports putting it at $16 billion and others at $20 billion. — Ian Miller Outkick, FOXNews.com, 21 Aug. 2026 In seeking a new trial, Anthony’s attorneys have argued that the June proceedings were marred by strict courtroom rules and improper jury instructions. — ABC News, 20 Aug. 2026 While most judges have categorized such requests as overreaching or for an improper purpose, two out of three judges on the panel ruled that there was nothing out of line about the QueerDoc request. — Theresa Gaffney, STAT, 20 Aug. 2026 See All Example Sentences for improper

Recent Examples of Synonyms for improper

Adjective

During the first week of school, a Diamond Hill-Jarvis High School teacher was placed on leave over allegations of an inappropriate relationship with a student.

— Maven Navarro, Fort Worth Star-Telegram, 25 Aug. 2026
The content was inappropriate and does not reflect our values.

— Gregg Evans, New York Times, 25 Aug. 2026

Definition of inappropriate

Adjective

When channels are created with unsuitable blades, angles, or placement, transplanted hair may grow in an unnatural direction or produce an overly uniform appearance.

— Connie Etemadi, USA Today, 10 Aug. 2026
Websites often attract unsuitable clients due to ineffective copy, hindering business growth.

— Jodie Cook, Forbes.com, 1 Aug. 2026

Definition of unsuitable

Adjective

In between some of the manager’s more clip-worthy quotes, there were more of his usual — and not incorrect — platitudes.

— Cody Stavenhagen, New York Times, 25 Aug. 2026
Mosseri said the plaintiff lawyers are incorrect in suggesting that Meta also reduced the number of researchers studying youth mental health harms after Haugen’s leaks.

— Jonathan Vanian, CNBC, 25 Aug. 2026

Definition of incorrect

Adjective

The complaint also alleges Wendy's failed to warn customers of the alleged danger and served food that was unfit for human consumption.

— Anthony Thompson, USA Today, 25 Aug. 2026
His reelection campaign has been rocked by the allegations made by his ex-wife, Emily Moreno, and her senator dad, who says Miller is unfit to serve in Congress.

— Dave Goldiner, New York Daily News, 13 Aug. 2026

Definition of unfit

Adjective

Garcia and fellow Democrats are mindful of what’s driving unhappy voters who face a vexing mix of inflation and weak economic growth.

— Los Angeles Times, Los Angeles Times, 27 Aug. 2026
Sometimes kids performing things on TV look unhappy or awkward, but this girl seems to genuinely enjoy singing while her dad plays guitar.

— Rebecca Alter, Vulture, 25 Aug. 2026

Definition of unhappy

Browse Nearby Words

impromptus

improper

improperly

See all Nearby Words

Cite this Entry

Style

“Improper.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/improper. Accessed 1 Sep. 2026.

Copy Citation

Synonyms of improper

adjective

Synonym Chooser

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

conscientious

Popular in Grammar & Usage

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Why does English have so many silent letters?

7 Pairs of Commonly Confused Words

Popular in Wordplay

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

Even More Words That Sound Like Insults But Aren't

Even More Bird Names that Sound Like Insults (and Sometimes Are)

12 Lovely and Unusual Words for the Natural World

Popular

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

Games & Quizzes