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
noun
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imp -
A mischievous but harmless trouble maker
Charlie's mother shouted at him, "Stop jumping up and down on your bed and acting like a little imp, and try to be just a little serious and clean up your room."
noun
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schnook -
A person easily duped; a fool
Charlie Brown was a schnook because he never expected before it happened that Lucy would pull the football away from him every single time.
noun
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ninny -
A foolish person
It didn't matter that Roland was wearing a nice suit; his ridiculous red wig and fake glasses seemed to indicate to others that he was just a fooling ninny.who didn't have to be taken seriously.
adjective
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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.
adjective
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pointless -
Having no purpose, and is not worth doing
Though Bill's parents wanted him to be a doctor, he didn't find it interesting, and hated the sight of blood, so he thought it was pointless to apply to medical school.
noun
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dupe -
A victim of deception
The homeless man tried to sell magic beans to a passing man because he looked like a dupe.
adjective
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naive -
Too ready to believe someone or something, or to trust that someone's intentions are good, often because of a lack of experience:
When meeting strangers at parties, it's important not to be naive about accepting their invitations.
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gibberish -
Unintelligible, confused, or meaningless speech or writing
After the politician spoke for 10 minutes, Barry realized that nothing that he said made sense, and all the fast talking fancy phrases were nothing but gibberish.
adjective
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inept -
Having or showing no skill; clumsy
In his rookie debut, Omar seemed inept because he struck out every time he was at bat for his first 4 games, but then he improved, much to his and his team's relief.
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bozo -
A stupid, rude, or insignificant person, especially a man
Martin was a bozo who would always act rudely to people, and as a result his boss was considering letting him go.
adjective
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feckless -
Lacking initiative or strength of character; irresponsible
Keith was feckless because he refused to leave the house and find a job.