infeasible

[in-fee-zuh-buhl]
adjective
not feasible; impracticable.

Origin:
1525–35; in-3 + feasible

infeasibility, infeasibleness, noun
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World English Dictionary
infeasible (ɪnˈfiːzəbəl)
 
adj
a less common word for impracticable
 
infeasi'bility
 
n
 
in'feasibleness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
All were discarded as too expensive or physically infeasible.
If enough people do so, it will drive grain prices high enough to make ethanol production economically infeasible.
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