improper
/ɪmˈpɹɑ.pɚ/adjective
improper is spelled I-M-P-R-O-P-E-R: 8 letters and 3 syllables. It appears 3.8 times per million words in written English, the 13,321st most frequent word form (wordfreq, 2021 data). As an adjective, improper means “Unsuitable to needs or circumstances; inappropriate; inapt” (English Wiktionary, September 2026).
How many letters and syllables are in improper?
| Letters | 8: I-M-P-R-O-P-E-R |
|---|---|
| Syllables | 3 (from its American pronunciation) |
| In writing | 3.8 times per million words; the 13,321st most frequent word form |
| Wrong spellings searched | none measured in search |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is improper?
Improper appears 3.8 times per million words in written English, the 13,321st most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce improper?
- UK /ɪmˈpɹɒp.ə/
- Australia /ɪmˈpɹɔp.ə/
- US /ɪmˈpɹɑ.pɚ/
Improper has 3 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-improper.wav, LL-Q1860_(eng)-Qwertygiy-improper.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with improper?
11 words on PlainSpell end in the same sounds as improper from its last stressed vowel (/ɑpəɹ/):
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of improper
- more improper comparative
- most improper superlative
- impropers present, singular, he/she/it
- impropering participle, present
- impropered participle, past
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does improper mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Unsuitable to needs or circumstances; inappropriate; inapt.
- 2
Not in keeping with conventional mores or good manners; indecent or immodest.
improper conduct
- 3
Not according to facts; inaccurate or erroneous.
- 4
Not consistent with established facts; incorrect.
- 5
Not properly named; See, for example, improper fraction.
- 6
obsoleteNot specific or appropriate to individuals; general; common.
- 7
Of a complex random variable, correlated with its conjugate.
verb
- 1
obsoleteTo appropriate; to assign (something, to someone) as a possession or prerogative.
For quotations using this term, see Citations:improper.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Improper in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | impropre, inapproprié, inadapté , inconvenant, grossier |
| German | unpassend , unhöflich |
| Portuguese | impróprio , indecente, indecoroso , incorreto |
| Spanish | improprio, impropio, indebido |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does improper come from?
From Middle French impropre, from Latin improprius (“not proper”), from in- + proprius (“proper”). By surface analysis, im- + proper.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).