Bad / Stupid
laughingstock - A person or group that is made fun of and looked down on.
As the basketball season progressed and they won no games, they were concerned that they were becoming a laughingstock of the sports world.
misguided - Having or showing faulty judgment or reasoning.
She shouted at him, 'If you think you can get me to marry you by controlling me, then you are terribly misguided.'
impractical - Not useful, unlikelly to succeed, not sensible or realistic.
Attaching wings to arms was an impractical method for man to be able to fly.
laughable - So stupid as to be funny and not worth serious consideration; bad in a way that seems foolish or silly
Because he had a bad cold and was drunk his attempt to sing at the party were laughable.
nonsense - Words or actions that are silly, stupid, make no sense, and have no meaning.
The jury felt that the defendant's alibi sounded like nonsense.
witless - Stupid, foolish, and showing no intelligence.
The witless criminal decided that for his first heist, he would attempt to rob a gun store that had many armed people in it.
irresponsible - Not thinking enough or not worrying about the possible results of what you do
When Mom came home and found the house empty and the door unlocked, she told her kids that was an irresponsible thing to do