無根 is read as むこん (mukon) and means groundless.
むこん
mukon
じじつむこん
groundless
むこんきょ
baseless
ねなし
rootless
ねなしぐさ
duckweed
ぶにん
shorthandedness
むりやり
forcibly
むり
impossible
むちゃ
rash
むりょう
free (of charge)
ぶじ
good health
むしょく
without an occupation
むごん
silence (not speaking)