The fear of gaiety or fun is known as cherophobia.

The fear of gaiety (fun) is known as cherophobia

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Phallophobia is the fear of penis

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The fear of growing old is known as gerascophobia

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The fear of thunder and lightning is known as brontophobia

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Hypnophobia is the fear of sleep

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Rhytiphobia is the fear of getting wrinkles

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The fear of ataxia (muscular incoordination) is known as ataxiophobia