Skip to definition.  Adjective: incautious  in'ko-shus   1.
Lacking in caution     "an incautious remark"; "incautious talk"
2. Carelessly failing to exercise proper caution     "an
incautious step sent her headlong down the stairs"  See also:
adventuresome, adventurous, brainish [archaic], careless,
cavalier, hotheaded, impetuous, impulsive, madcap, tearaway
Antonym: cautious  Encyclopedia: Incautious