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"