" recklessly "

1: as in impulsively, thoughtlessly;

•  Synonyms : 

•  headfirst,

•  headily,

•  hotheadedly,

•  impatiently,

•  impetuously,

•  impulsively,

•  thoughtlessly,

•  cursorily,

•  hastily,

•  headlong,

•  hotfoot,

•  hurriedly,

•  pell-mell,

•  precipitately,

•  precipitously,

•  rashly,

•  automatically,

•  glancingly,

•  haphazardly,

•  impromptu,

•  spontaneously,

•  abruptly,

•  suddenly,

•  offhand,

•  offhandedly

•  Antonyms : 

•  deliberately,

•  studiedly,

•  calculatingly,

•  circumspectly,

•  designedly,

•  falteringly,

•  haltingly,

•  hesitantly,

•  hesitatingly,

•  tentatively,

•  leisurely,

•  slowly

1: having or showing a lack of concern for the consequences of one's actions;

  * e.g., " ... the reckless skiers were making everyone nervous by schussing down the mountainside at lightning speed "

•  Synonyms : 

•  daredevil,

•  devil-may-care,

•  foolhardy,

•  harum-scarum,

•  hell-for-leather,

•  irresponsible,

•  kamikaze

•  Antonyms : 

•  responsible

2: foolishly adventurous or bold;

  * e.g., " ... the calamitous accident was caused by a reckless driver who cut off the semitrailer "

•  Synonyms : 

•  audacious,

•  brash,

•  daredevil,

•  foolhardy,

•  madcap,

•  overbold,

•  overconfident,

•  temerarious

•  Antonyms : 

•  careful,

•  cautious,

•  circumspect,

•  guarded,

•  heedful,

•  prudent,

•  safe,

•  wary