UNFEASIBLE
a.s as z. That cannot be done; impracticable.
unfeasible
un fea si ble ▶adjective inconvenient or impractical: childcare is expensive, making the return to work unfeasible for many women. DERIVATIVES un fea si bil i ty noun, un fea si bly adverb
un |feas ¦ible |ʌnˈfiːzɪb (ə )l | ▶adjective inconvenient or impractical: childcare is expensive, making the return to work unfeasible for many women. DERIVATIVES unfeasibility |-ˈbɪlɪti |noun, unfeasibly adverb