noun
the quality or state of being impractical; lack of practicality
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The decision to build a bridge in that location was met with criticism due to its impracticality.
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I don't see the point in buying that expensive gadget, it's just pure impracticality.
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Wearing high heels to a hiking trip is just plain impracticality.
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His constant daydreaming about becoming a millionaire shows the impracticality of his thinking.