incautious

adjectives

lacking in caution
"an incautious remark"; "incautious talk"
antonym
is similar to
characterized by undue haste and lack of thought or deliberation
"a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; (`brainish' is archaic)
see also
willing to undertake or seeking out new and daring enterprises
"adventurous pioneers"; "the risks and gains of an adventuresome economy"
see also
marked by lack of attention or consideration or forethought or thoroughness; not careful
"careless about her clothes"; "forgotten by some careless person"; "a careless housekeeper"; "careless proofreading"; "it was a careless mistake"; "hurt by a careless remark"
carelessly failing to exercise proper caution
"an incautious step sent her headlong down the stairs"
is derived from
is similar to
marked by lack of attention or consideration or forethought or thoroughness; not careful
"careless about her clothes"; "forgotten by some careless person"; "a careless housekeeper"; "careless proofreading"; "it was a careless mistake"; "hurt by a careless remark"