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infeasible

/ɪnˈfiːzəbəl/ · in·feas·i·ble
adjective
  1. Not capable of being done, achieved, or put into practice; impossible or impractical. Constructing a skyscraper on the sand dunes within a month was simply infeasible.
Did you know? The word 'infeasible' first appeared in English in the 1840s, shortly after 'feasible' entered the language, reflecting the era's growing interest in engineering and project planning.
Written by Lexi Wordsworth, Dictionary Editor 2 lookups Added Jul 22, 2026