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.
adjective
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Bad /
Crazy
audio
loony -
Crazy or silly
The patients in the mental hospital could be described as loony, but the doctors tried to treat them as normal human beings with normal problems in order to try to help them get better.
noun
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Bad /
Crazy
audio
weirdo -
A person whose dress or behavior seems strange
The weirdo kept peeking at everyone from behind the bushes.