Source : Webster's Revised Unabridged Dictionary (1913)

Inofficious \In`of*fi"cious\, a. [L. inofficiosus: cf. F.
   inofficieux. See {In-} not, and {Officious}.]
   1. Indifferent to obligation or duty. [Obs.]

            Thou drown'st thyself in inofficious sleep. --B.
                                                  Jonson.

   2. Not officious; not civil or attentive. [Obs.] --Jonhson.

   3. (Law) Regardless of natural obligation; contrary to
      natural duty; unkind; -- commonly said of a testament made
      without regard to natural obligation, or by which a child
      is unjustly deprived of inheritance. ``The inofficious
      testament.'' --Blackstone. ``An inofficious disposition of
      his fortune.'' --Paley.