What is "improper feud"

Improper \Im*prop"er\, a. [F. impropre, L. improprius; pref. im- not + proprius proper. See Proper.]

1. 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.

   Follow'd his enemy king, and did him service, Improper for a slave.
   --Shak.

   And to their proper operation still, Ascribe all Good; to their improper, Ill.
   --Pope.

2. Not peculiar or appropriate to individuals; general; common. [Obs.]

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

3. Not according to facts; inaccurate; erroneous.

   Improper diphthong. See under Diphthong.

   Improper feud, an original feud, not earned by military service.
   --Mozley & W.

   Improper fraction. See under Fraction.