deranged -
Behaving in an uncontrolled or dangerous way because of mental illness
Charles Manson led a group of followers who became mentally deranged as a result of taking too many psychedelic drugs
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adjective
daffy -
Silly, different, strange, and funny
Fred had a twirled mustache and wore an oddly colored suit, but the town's residents simply viewed him as daffy instead of someone to be afraid of.
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adjective
delusional -
Seeing or believing things that are not real
Betty was confident that she would be a millionaire by the time she would be 25, but her friends thought she was delusional.
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noun
crackpot -
A slightly strange or foolish person
Wearing mismatched clothing and yelling to nobody in particular, the crackpot was amusing and ignored by the people who passed him by.
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adjective
zany -
Amusingly unconventional and different
Einstein was unique among geniuses in that he also had a silly and zany side of his personality.
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noun
weirdo -
A person whose dress or behavior seems strange
The weirdo kept peeking at everyone from behind the bushes.
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noun
crank -
Someone who others think has unusual ideas or behaves strangely
Bill was seen as crank by his friends, because of the way he always spoke of the dangers of eating meat and being vaccinated.
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adjective
unhinged -
Mentally unbalanced and unstable
Trevor crossed the street when he saw the unhinged person yelling at him.
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adjective
mercurial -
Changing emotions suddenly and often
Fred loved almost everything about his wife except her mercurial behavior, where her moods changed suddenly between sadness and happiness, or love and anger
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adjective
hysterical -
Having uncontrolled extreme emotion
When Amy found out that her house had been destroyed by the tornado, she broke down into hysterical crying, and could not be comforted for hours.
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adjective
batty -
Mad and slightly crazy, usually in a humorous way
The computer system wouldn't let Greg log on or change his password, and it was driving him batty.
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wacky -
Something that is strange and different to the point of amusement.
George’s grandmother was well known and loved for her wacky taste in shoes.
