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reckless

If you are reckless, you don't think or care about the consequences of your words or actions, like a reckless driver who speeds while texting, knitting, and eating a sandwich.

The word reckless comes from the Old English word receleas, meaning "careless, thoughtless, heedless." If you have a reckless attitude, you aren't concerned about what happens to yourself or others who are affected by your actions. In this usage, reckless is the opposite of considerate. Reckless friends will invite people you don't know to your house because with your parents away, it's party time. Surprise!

Definitions of reckless
  1. adjective
    marked by defiant disregard for danger or consequences
    “"became the fiercest and most reckless of partisans"-Macaulay”
    “a reckless driver”
    synonyms: foolhardy, heady, rash
    bold
    fearless and daring
  2. adjective
    characterized by careless unconcern
    reckless squandering of public funds”
    synonyms: heedless
    careless
    marked by lack of attention or consideration or forethought or thoroughness; not careful
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