Components
ない is an exact match with one form of the following word:
ない
BOOST
1. nonexistent; not being (there)  (see also: 亡い; often written with kana only)
2. unpossessed; unowned; not had
3. unique  (see also: またとない)
4. indicates negation, inexperience, unnecessariness or impossibility  (as ...ことがない, etc.)
auxiliary adjective
5. not ...  (see also: ない; after the ren'youkei form of an adjective)
6. to not be...; to have not ...  (after the -te form of a verb)
My mastery:
My current mastery of ない:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 3 (among the 3,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 125,318 which gives a rank of 2,432
ない is the most useful form. 1 additional form is shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is used about 90% of the time
• Google Japan frequency rank: 300 (about 2,520,000,000 results)
• Wikipedia most common 20000 words rank: 21
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 45 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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Example sentences:
まこ
真子
この
てがみ
手紙
かいたはずない
Mako cannot have written this letter.
わたし
かれ
まった
かんけい
関係
ない
I have nothing to do with them.
すわ
いすない
There's no chair to sit upon.
無い
BOOST
Reading : ない   
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 3,000 (about 307,000,000 results)
• iknow! Core 6000 rank: 247 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 653
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 45 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
VIEW INFLECTIONS
ム   ブ   な not   
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