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fad
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dziwactwo, fantazja, kaprys, moda
How long do you think this Internet fad is going to last?
This device is not just a fad, it is reality.
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quirk
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oddity
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peculiarity
He is known for his peculiarities.
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eccentricity
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twist
[COUNTABLE]
He has many twists, you have to get used to them.
Your twists are adorable.
I have to live with my husband's twists.
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idiosyncrasy
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kink
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weirdness
[UNCOUNTABLE]
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crankiness
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pottiness
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ratbaggery