adj.

1. Not suited to circumstances or needs; unsuitable: improper shoes for a hike; improper medical treatment.
2. Not in keeping with conventional mores; indecorous: improper behavior.
3. Not consistent with established truth, fact, or rule; incorrect.
4. Irregular or abnormal.

improperly im·prop'er·ly adv.
improperness im·prop'er·ness n.

SYNONYMS  improper, unbecoming, unseemly, indelicate, indecent, indecorous. These adjectives mean not in keeping with accepted standards of what is right or proper. Improper often refers to unethical conduct, a breach of etiquette, or morally offensive behavior: improper business practices; improper behavior at the dinner table. Unbecoming suggests what is beneath the standard implied by one's character or position: language unbecoming to an officer. What is unseemly or indelicate is in gross violation of good taste; indelicate especially suggests immodesty, coarseness, or tactlessness: an unseemly use of profanity; an indelicate suggestion. Indecent refers to what is morally offensive or harmful: an earthy but not indecent story. Indecorous implies violation of societal manners: an indecorous remark about overeating.

adjective

1. Not suited to circumstances: inappropriate, inapt, incongruous, inept, malapropos, unapt, unbecoming, unbefitting, unfit, unseemly, unsuitable. Idioms: out of place. See agree/disagree, usual/unusual.
2. Not in keeping with conventional mores: immodest, indecent, indecorous, indelicate, naughty, unbecoming, unbefitting, unseemly, untoward. Idioms: out of line. See usual/unusual.

adj

Definition: not suitable
Antonyms: acceptable, appropriate, correct, fitting, proper, right, suitable

adj

Definition: vulgar, immoral
Antonyms: decent, formal, good, moral, proper, uncorrupt

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IN BRIEF: Not correct. Or showing bad manners.

Let enough negative thoughts or improper thoughts get into the human mind and the person sinks just like a ship. — Alfred Montapert, American motivational writer.

Dansk (Danish)
adj. - upassende, sjofel, usømmelig, uanstændig, forkert, uretmæssig, utilbørlig

idioms:

• improper fraction    uægte brøk

Nederlands (Dutch)
ongepast, onjuist

Français (French)
adj. - impropre, peu convenable, incorrect (un usage), inexact, indécent, malséant, déplacé

idioms:

• improper fraction    expression fractionnaire

Deutsch (German)
adj. - unpassend, unanständig, unzulässig

idioms:

• improper fraction    (Math.) unechter Bruch

Ελληνική (Greek)
adj. - ανάρμοστος, απρεπής, ακατάλληλος, εσφαλμένος, ανακριβής

idioms:

• improper fraction    (μαθημ.) καταχρηστικό κλάσμα

Italiano (Italian)
sconveniente, improprio

idioms:

• improper fraction    frazione impropria (numeratore maggiore del denominatore)

Português (Portuguese)
adj. - impróprio

idioms:

• improper fraction    fração (f) imprópria (Mat.)

Русский (Russian)
неподходящий, ошибочный, непристойный

idioms:

• improper fraction    неправильная дробь

Español (Spanish)
adj. - impropio, incorrecto, indecente, indecoroso, inadecuado

idioms:

• improper fraction    fracción impropia

Svenska (Swedish)
adj. - oegentlig, opassande, oanständig, otillbörlig, olämplig

中文（简体） (Chinese (Simplified))
不合适的, 不道德的, 错误的

idioms:

• improper fraction    假分式, 假分数

中文（繁體） (Chinese (Traditional))
adj. - 不合適的, 不道德的, 錯誤的

idioms:

• improper fraction    假分式, 假分數

한국어 (Korean)
adj. - 부적당한, 어울리지 않는, 온당치 못한

日本語 (Japanese)
adj. - 不適当な, 誤った, 下品な, 卑わいな

idioms:

• improper fraction    仮分数

العربيه (Arabic)
‏(صفه) غير لائق‏

עברית (Hebrew)
adj. - ‮לא הוגן, לא מתאים, גס, מוטעה, לא נכון, מגונה‬

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