illegitimately

from WordNet (r) 3.0 (2006)

illegitimately
    adv 1: in a manner disapproved or not allowed by custom; "He
           acted illegitimately when he increased the rent fourfold"
           [syn: {illegitimately}, {illicitly}] [ant: {lawfully},
           {legitimately}, {licitly}]
    2: of biological parents not married to each other; "this child
       was born illegitimately" [syn: {illegitimately}, {out of
       wedlock}] [ant: {legitimately}]

from The Collaborative International Dictionary of English v.0.48

Illegitimately \Il`le*git"i*mate*ly\, adv.
   In a illegitimate manner; unlawfully.
   [1913 Webster]