The Collaborative International Dictionary of English v.0.48:

disregard \dis`re*gard"\, v. t. [imp. & p. p. disregarded; p.
   pr. & vb. n. disregarding.]
   Not to regard; to pay no heed to; to omit to take notice of;
   to neglect to observe; to slight as unworthy of regard or
   notice; as, to disregard the admonitions of conscience.
   [1913 Webster]

         Studious of good, man disregarded fame.  --Blackmore.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disregarded
    adj 1: not noticed inadvertently; "her aching muscles forgotten
           she danced all night"; "he was scolded for his forgotten
           chores" [syn: disregarded, forgotten]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "disregarded":
   abandoned, absolved, acquitted, blotted, canceled, condoned,
   deserted, exculpated, excused, exonerated, forgiven, forgotten,
   half-done, ignored, indulged, laid aside, left undone, missed,
   neglected, omitted, overlooked, pardoned, passed by, passed over,
   passed up, pigeonholed, put aside, redeemed, remitted, reprieved,
   shriven, shunted, sidelined, sidetracked, slighted, spared,
   unasked, unattended to, unavenged, uncared-for, unchaperoned,
   uncondemned, unconsidered, undone, unregarded, unresented,
   unrevenged, unsolicited, untended, unwatched, wiped away