The opposite of an adventurer is a couch-potato.
Timid
fun, adventurous
Staid means sedate, respectable, unadventurous. The antonym would therefore be frivolous, adventurous, or sporting.
adventurous
The adventurous hero was frozen in his tracks. The adventurous hero was named Nimrod. Which of you wishes to be remembered as an adventurous hero? What will the adventurous hero do next? Wasn't that episode of the adventurous hero just thrilling?
Adventurous.
Yes she is adventurous.
Adventurous is rash and enterprising.
Adventures
enthusiastic.
abseiling is very adventurous
I was on a adventurous trip in the jungle.