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adjective
wacky - Something that is strange and different to the point of amusement.
hysterical - Having uncontrolled extreme emotion
noun
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Psycho - A person with severe mental health issues, often describing someone who behaves in an erratic or dangerous manner.
Blabbermouth - An overly talkative person who speaks without thinking.
Mischievous - Playfully causing trouble or annoyance, often in a fun or harmless way.
crank - Someone who others think has unusual ideas or behaves strangely
Compulsion - A strong, irresistible urge to do something, often against one's better judgement.
deranged - Behaving in an uncontrolled or dangerous way because of mental illness
Maniac - Someone who is mentally ill tending towards violent and dangerous behavior.
batty - Mad and slightly crazy, usually in a humorous way
weirdo - A person whose dress or behavior seems strange
daffy - Silly, different, strange, and funny