Components
なくなる is an exact match with one form of the following word:
なくなる
BOOST
'ru' godan verb, intransitive verb
1. to be lost (e.g. luggage); to be missing  (often written with kana only)
2. to be used up; to be run out; to be exhausted; to be consumed; to be reduced to zero; to not occur any more  (often written with kana only)
3. to disappear (e.g. pain); to be lost (e.g. a dream, confidence)  (often written with kana only)
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My current mastery of なくなる:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 4 (among the 5,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 111,274 which gives a rank of 3,652
なくなる 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: 6,000 (about 131,000,000 results)
• Wikipedia most common 20000 words rank: 3309
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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Example sentences:
およ
いでいる
ひとたち
人達
からだ
えて
かんかく
感覚
なくなっていた
The swimmers were numb with cold.
ゆびわ
指輪
ひと
げんきん
現金
なん
ドル
なくなっています
A ring and some cash are missing.
わたし
りょひ
旅費
なくなった
I have run out of my traveling expenses.
無くなる
BOOST
Reading : なくなる   
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 44,000 (about 11,700,000 results)
• This form appears in Wikipedia's list of JLPT N4 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 1715 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 6905
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
VIEW INFLECTIONS
ム   ブ   な not   
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