Components
古い is an exact match with one form of the following word:
古い
BOOST
Reading : ふるい   
old (not person); aged; ancient; antiquated; stale; threadbare; outmoded; obsolete article
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My current mastery of 古い:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 1 (among the 500 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 170,631 which gives a rank of 151
古い is the most useful form. 3 additional forms are 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)
• This form appears in Wikipedia's list of JLPT N5 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 95 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 2333
• 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 16 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:
わたし
ふる
くるま
いました

I bought an old car.
わたし
ふる
じてんしゃ
自転車
っている

I have an old bicycle.
わたし
ふる
ゆうじん
友人
った

I saw an old friend of mine.
ふるい
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 45,000 (about 11,200,000 results)
• 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 16 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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旧い
BOOST
Reading : ふるい   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 119,000 (about 1,100,000 results)
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故い
BOOST
Reading : ふるい   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 134,000 (about 731,000 results)
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コ   ふる old   -ふる to grow old   
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ジュウ   ジッ   と    とお ten   
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イチ   イツ   ひと    ひと- one   
stick   
コウ   ク   くち mouth   
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キュウ    former, old   
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ニチ   ジツ   sun; day   ひ    -か    
コ   strike   ゆえ reason; deceased   
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ぼく strike   
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