2. Couldn't help themselves. (lack of impulse control, compulsive behavior)
3. Space cadets. (lack of full circumstantial awareness)
The reverse of all of these being, of course, overly cautious, prudent behavior. A coward.
The brave and the stupid.
Maybe some of us are just lucky.
Prudent is to know that your chances are not good and then refrain yourself despise the pressure you could feel to act.
To be brave is to be scared but to realize that is the moment to act and do it. To be coward is the same but not acting.
You have to be scared to be brave.
To be stupid is not to be scared when you should be.
Knowing how to balance all that would be being wise.
It's all subjective, and a matter of preference. Denigrating people because they don't have the same preference as you is a dick move.
An example of stupid behavior might be betting $10,000 that you will win the office March Madness pool, because you personally know the coach of Duke and are just convinced that he is a winner that will go all the way. That's stupid.
But if you are Warren Buffet and bet $1 billion (with a 'b') that no one at all will correctly call every game in this years NCAA basketball tournament[0], that's not stupid, that's informed and prudent risk-taking.
[0] http://time.com/34358/no-one-won-warren-buffetts-1-billion-b...
Cowards are just jealous ;)