Someone heedless is reckless or not paying attention. Heedless rhymes with needless, and someone who's heedless acts as if needed things are needless. If you head out to surf in a tsunami, you're heedless of the giant-wave warnings.

When you pay heed to something you pay attention to it or consider it, but if you’re heedless you do the opposite. Sometimes being heedless means being a risk-taker in an exciting way, or it can just mean losing track of time, but often it describes being inconsiderate. If you keep raising the volume when your brother asks you to turn down the music, you’re heedless of his need to study, and if you're heedless of the yellow tape that says "Do not cross," you disregard the law.

Definitions of heedless
  1. adjective
    marked by or paying little heed or attention
    “We have always known that heedless self-interest was bad morals”
    heedless of danger”
    heedless of the child's crying”
    synonyms: unheeding
    careless, regardless
    (usually followed by `of') without due thought or consideration
    deaf, indifferent
    (usually followed by `to') unwilling or refusing to pay heed
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    attentive, heedful, paying attention, thoughtful
    taking heed; giving close and thoughtful attention
  2. adjective
    characterized by careless unconcern
    “"the heedless generosity and the spasmodic extravagance of persons used to large fortunes"- Edith Wharton”
    synonyms: reckless
    marked by lack of attention or consideration or forethought or thoroughness; not careful
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