Denshi Jisho — Online Japanese dictionary

ない 1: not (verb-negating suffix; may indicate question or invitation with rising intonation);
2: () emphatic suffix (used after the root of an adjective)
Common word, Auxiliary adjective 
内 ない inside; within
Suffix 
莫 まな must not; may not
Noun, Archaism 
無い 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 
亡い ない dead
Adjective 
地震 ない earthquake
Out-dated or obsolete kana, Noun 
莫迦 ばか 1: fool; idiot;
2: trivial matter; folly; absurdity;
3: (Na-adjective) foolish; stupid; dull; absurd; ridiculous;
4: (Noun) (Abbreviation) surf clam
Out-dated kanji, Noun 
ナイス nice
Common word, Noun 
ナイト 1: night;
2: knight
Common word, Noun 
ナイフ knife
Common word, Noun 
ナイル Nile (river)
Common word, Noun, Usually written using kana alone 
ナイン 1: nine;
2: (Interjection) no (ger: nein)
Common word, Noun 
ないか 1: (used to ask a question in the negative) won't (hasn't, isn't, doesn't, etc.);
2: (used to make invitations, express desires or give indirect commands) won't you
Expression 
ないで 1: without doing ...;
2: (Auxiliary) used in sentence-final position as an indirect prohibition
Conjunction, Auxiliary 
内科 ないか 1: internal medicine, i.e. treatment by medical procedures rather than surgical procedures;
2: department of internal medicine (hospital, etc.)
Common word, Noun, No-adjective 
内規 ないき private regulations; bylaws; internal rules; tradition
Common word, Noun 
乃至 ないし 1: from ... to; between ... and;
2: or
Common word, Conjunction 
内示 ないじ unofficial announcement
Common word, Noun, Suru verb 
内部 ないぶ interior; inside; internal
Common word, Noun, No-adjective 
内務 ないむ internal or domestic affairs
Common word, Noun 
内野 ないや (baseball) infield; diamond
Common word, Noun 
内意 ないい intention; personal opinion
Noun 
内儀 ないぎ one's wife; landlady; something secret or confidential
Noun 
内議 ないぎ secret conference; private consultation
Noun 
内供 ないぐ inner offerer (any of the 10 high-ranking monks serving at the inner offering hall)
Noun, Abbreviation 
内侍 ないし maid of honor; maid of honour
Out-dated or obsolete kana, Noun 
内旨 ないし emperor's secret orders
Noun 

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