improper

• impropre (obsolete)

From Middle French impropre, from Latin improprius (“not proper”), from in- + proprius (“proper”), equivalent to im- +‎ proper.

• (Received Pronunciation) IPA^(key): /ɪmˈpɹɒp.ə/

  • Audio (Southern England)

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• (General Australian) IPA^(key): /ɪmˈpɹɔp.ə/
• (General American) IPA^(key): /ɪmˈpɹɑ.pɚ/
• Rhymes: -ɒpə(ɹ)

improper (comparative more improper, superlative most improper)

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. (obsolete) Not specific or appropriate to individuals; general; common.
   • 1608, John Fletcher, The Faithful Shepherdess:

     Not to be adorned with any art but such improper ones as nature is said to bestow, as singing and poetry.

7. (mathematics) Of a complex random variable, correlated with its conjugate

• unproper (obsolete or rare)

improper (third-person singular simple present impropers, present participle impropering, simple past and past participle impropered)

1. (obsolete, transitive) To appropriate; to limit.
   • 1565, John Jewel, letter to Thomas Harding:

     He would in like manner improper and inclose the sunbeams to comfort the rich and not the poor.

2. (obsolete) To behave improperly

• impropre