noun
a person or thing that is impracticable
adjective
not capable of being put into practice or carried out
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The proposed plan was deemed impracticable due to budget constraints.
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It's impracticable to expect everyone to attend the meeting on such short notice.
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Trying to finish this project by tomorrow is just plain impracticable.
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Her dreams of becoming a famous singer were considered impracticable by her parents.