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Adverb: regardless  ri'gaa(r)d-lus
  1. In spite of everything; without regard to drawbacks
    "he carried on regardless of the difficulties";
    - irrespective, no matter, anyway
Adjective: regardless  ri'gaa(r)d-lus
  1. (usually followed by ‘of’) without due thought or consideration
    "crushing the blooms with regardless tread";
    - careless

See also: heedless, unheeding

Encyclopedia: Regardless