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Adjective: incautious  in'ko-shus
  1. Carelessly failing to exercise proper caution
    "an incautious step sent her headlong down the stairs"
  2. Lacking in caution
    "an incautious remark"; "incautious talk"

See also: adventuresome, adventurous, brainish [archaic], careless, cavalier, hotheaded, impetuous, impulsive, madcap, tearaway

Antonym: cautious