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Adjective: heedless  heed-lus
  1. Marked by or paying little heed or attention
    "heedless of danger"; "We have always known that heedless self-interest was bad morals; we know now that it is bad economics";
    - unheeding
  2. Characterized by careless unconcern
    "the heedless generosity and the spasmodic extravagance of persons used to large fortunes";
    - reckless

See also: attentiveness, careless, cavalier, deaf, heed, indifferent, paying attention, regard, regardless

Antonym: thoughtful