Incautious (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">incautious</span>' is the definition.<br/ ><span class="explanation-format__explanation">(associated in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for careless that I've seen before include "Unthinking and irresponsible" , "Inattentive to one's work" , "Not careful or thorough enough" , "'Thoughtless, inattentive (8)'" , "Lax" .)
(Other definitions for heedless that I've seen before include "Showing a lack of care or attention" , "Reckless, careless" , "Imprudent" , "Paying no attention, to advice or danger" , "Unconcerned" .)