不応 is read as ふおう (fuou) and means refractory.
ふおう
fuou
ふそうおう
unsuited
ふおうき
refractory period
ぶんふそうおう
beyond one's means or position
みぶんふそうおう
たいおうふか
incompatible (e.g. device)
ふしん
dullness
ふとうめい
opacity
doubt
ふこう
(the crime of) cursing one's parents
ふりえき
disadvantage
ふかひ
inevitable
ぶきよう
clumsy