vacilão

Etymology
From.

Noun

 * 1)  a simpleton a person who lacks common sense
 * 2)  a screwup a person who often makes substantial mistakes
 * 3)  a snitch a person who informs and betrays his group
 * 4)  an imprudent person

Adjective

 * 1)  foolish, lacking in common sense
 * 2)  unreliable
 * 3)  imprudent