無援 is read as むえん (muen) and means helpless.
むえん
muen
こりつむえん
being isolated and helpless
むだ
futility
むじょうけん
unconditional
むし
disregarding
unrelated to the teachings of Buddha
むだづかい
waste (of money, time, etc.)
むぼう
reckless
むじゃき
innocent
むえき
useless
むさくい
random
むてき
invincible
むい
idleness