opposite to ‘wunderkind’ \ an accident prone person of any age
He’s an accident seeking somewhere to happen – a total blunderkind.
A young cocky and arrogant person (usually in middle to upper management) who is supremely overconfident in their very limited experience/knowledge and has no doubt that their future success is guaranteed when, in fact, said person is far more likely to fall through their own butt-hole and hang themselves than produce positive results.
a variation on the word wunderkind
Todd, recent college graduate and now office manager, proved he was a blunderkind of the highest order when he spent a week implementing a no gum chewing policy even though the company was on the verge of financial ruin.