nothing, naught, nil, zero 1084
無駄 むだ futility, uselessness 1862 1084
無料 むりょう free, no charge  
無視 むし disregard, ignore  
迎え むかえ meeting, person sent to pick up an arrival 2493
向く むく to face 2094 802
向かい むかい facing, opposite, across the street, other side  
向ける むける to turn towards, to point  
虫歯 むしば cavity, tooth decay, decayed tooth, caries 2154 709
寧ろ むしろ rather, better, instead 1033
結ぶ むすぶ to tie, to bind, to link 1104
夢中 むちゅう daze, (in a) trance, ecstasy, delirium, engrossment 1188
むね breast, chest 1462