Beyond description, 9 letters
For practical purposes, 8 letters
Useless condition, 15 letters
Lacking the power to be effective, 15 letters
Futility, 10 letters
A lack of efficacy, 10 letters
Lacking the power to be effective, 14 letters
A lack of efficacy, 17 letters
Unskillfulness resulting from a lack of efficiency, 12 letters