inofficious

in·of·fi·cious   (ĭn'ə-fĭsh'əs)    adj.   Law Contrary to natural affection or moral duty. Used of a will in which the testator disinherits the rightful heirs with insufficient reason. [Latin inofficiōsus, undutiful : in-, not; see in-1 + officiōsus, dutiful; see officious.]

Main Entry: in·of·fi·cious
Pronunciation: "i-n&-'fi-sh&s
Function: adjective
Etymology: Latin inofficiosus (of a will) ignoring the testator's duty to his relatives, from in- not + officiosus kind, dutiful, from officium service, kindness, duty
: of or relating to a disposition of property that has the effect of depriving descendants of the shares of a succession to which they are entitled by law