unheed

Etymology

From un- + heed.

verb

1. (transitive) To deliberately fail to heed or take notice of; disregard; ignore.
   Unfortunately, from its liability to accident, and the necessity of entrusting it to the care of those who are either so familiar with danger as to unheed its warnings, or so infatuated as to rely, in despite of its warnings, with over-weening confidence […] 1847, Minutes of Proceedings of the Institution of Civil Engineers
   Neither the fair young English strumpet, who was Dr. White's patient, should have been permitted to unheed his advice to abstain from intercourse, and thus go on scattering her dints until they struck down some gentle wife; nor the drunken youth, who forfeited his life to his folly, have been allowed to sow the seed of the disease he bore, […] 1882, Agrippa Nelson Bell, The Sanitarian
   Whilst busy down street today about 11 :30 a.m. I had a strong impression that I must go over to Mr. Martin's and see if there be any result of yesterday's experiment. I tried to unheed the impression but it grew upon me in spite of my determination to the contrary and finally at about twelve o'clock I mounted my cycle and rode over to Martin's. 1916, The Journal of the American Society for Psychical Research

noun

1. Inattention.
   I learnt I had missed, by rash unheed, My track; that, so the Will decided, In life death, we should be divided, And at the sense I ached indeed. 1990, Joseph Hillis Miller, Tropes, parables, performatives: essays on twentieth-century literature