無辜 is read as むこ (muko) and means innocent.
むこ
muko
ぶにん
shorthandedness
むりやり
forcibly
むり
impossible
むだ
futility
むちゃ
rash
むりょう
free (of charge)
ぶじ
good health
むじょうけん
unconditional
むしょく
without an occupation
むごん
silence (not speaking)
むせん
radio (communication)
むよう
unnecessary