1.Indifferent to obligation or duty. (Obs.) "Thou drown'st thyself in inofficious sleep."
2.Not officious; not civil or attentive. (Obs.)
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." "An inofficious disposition of his fortune."