Denshi Jisho — Online Japanese dictionary

1: un-; non-;
2: bad ...; poor ...
Prefix 
1: nothing; naught; nought; nil; zero;
2: (Prefix) un-; non-
Noun 
ない 1:
2: (Usually written using kana alone) nonexistent; not being (there);
3: unpossessed; unowned; not had;
4: unique;
5: indicates negation, inexperience, unnecessariness or impossibility; (Auxiliary adjective) (after the ren'youkei form of an adjective) not ...;
6: (after the -te form of a verb) to not be...; to have not ...
Common word, Adjective 
なし without
Common word, Noun, Noun suffix, Usually written using kana alone 
ぶじ safety; peace; quietness
Common word, Na-adjective, Noun 
むい idleness; inactivity
Common word, Na-adjective, Noun, No-adjective 
むが 1: selflessness; self-effacement; self-renunciation;
2: (Buddhist term) anatman (no-self, the Buddhist concept that in nothing does there exist an inherent self, soul, or ego)
Common word, Noun 
むき indefinite
Common word, Noun 
むし baseball with no outs
Common word, Noun 
むし disregard; ignore
Common word, Noun, Suru verb 
むじ plain; unfigured
Common word, Noun, No-adjective 
むだ futility; uselessness; pointlessness
Common word, Na-adjective, Noun 
むち shameless
Common word, Na-adjective, Noun 
むち ignorance; innocence; stupidity
Common word, Na-adjective, Noun 
むり unreasonable; impossible; overdoing
Common word, Na-adjective, Noun, Suru verb 
なき -less (often used after one word to modify another, e.g. soulless body); lacking; non-existing
Noun or verb acting prenominally, Suffix, Usually written using kana alone 
なげ appearing as if something doesn't exist; casual; offhand
Na-adjective 
むい lacking rank; ordinary (citizen)
Noun 
むい unintentional
Noun 
むう nonexistence or existence; absence or presence
Noun 
むか priceless
Noun, No-adjective 
むか nullification; annihilation
Noun, Suru verb 
むき (haiku) lacking seasonal references
Noun, No-adjective 
むき shameless
Noun, Na-adjective 
むき inorganic
Noun, No-adjective 
むぎ shameless
Noun, Na-adjective 

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