1 audacious, bold, brave, courageous, dare devil, daring, enterprising, derog foolhardy, heroic, intrepid, derog rash, derog reckless, valiant, venturesome.
2 an adventurous trip. challenging, dangerous, difficult, eventful, exciting, hazardous, perilous, risky.
A wayward terrier spent two days trapped under eight tonnes of rock before he was rescued by firefighters. Adventurous Georgie chased a fox into a hole near the Brecon Mountain Railway on 7 January.