Components
硬い is an exact match with one form of the following word:
硬い
BOOST
Reading : かたい   
1. hard; solid; tough  (esp. 固い amp 堅い for wood, 硬い for metal and stone)
2. stiff; tight; wooden; unpolished (e.g. writing)
3. strong; firm (not viscous or easily moved)
4. safe; steady; honest; steadfast
5. obstinate; stubborn
6. bookish; formal; stuffy  (opposite: 砕けた)
The main kanji forms of かたい are each appropriate in slightly different situations. For more detail see: https://japanese.stackexchange.com/questions/15501/硬い-堅い-固い-how-are-different-spellings-used ⇗
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My current mastery of 硬い:
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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 139,115 which gives a rank of 1,469
硬い is the most useful form. 5 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 40% of the time
• Google Japan frequency rank: 29,000 (about 21,200,000 results)
• This form appears in Wikipedia's list of JLPT N4 vocabulary (see JLPT collections)
• Wikipedia most common 20000 words rank: 7437
• 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 33 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:
いけ
かた
こお
っていた

The pond was frozen hard.
その
こおり
かた
くて
れない

The ice is too hard to crack.
にく
かた
くて
れない

The meat is tough and hard to cut.
固い
BOOST
Reading : かたい   
My flashcards:
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Usefulness and usage:
• This form is used about 30% of the time
• Google Japan frequency rank: 40,000 (about 13,200,000 results)
• This form appears in Wikipedia's list of JLPT N4 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 706 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 7634
• 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 46 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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堅い
BOOST
Reading : かたい   
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 61,000 (about 6,230,000 results)
• This form appears in Wikipedia's list of JLPT N4 vocabulary (see JLPT collections)
• Wikipedia most common 20000 words rank: 19289
• 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 29 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
• This form is used as an example of an official Joyo kanji reading
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緊い
BOOST
Reading : かたい   
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 148,000 (about 570,000 results)
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カタい
BOOST
Reading : かたい   
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Usefulness and usage:
• This form is rarely used
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かたい
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 20% of the time
• Google Japan frequency rank: 49,000 (about 9,520,000 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 46 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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コウ   かた hard   
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セキ   シャク   コク   いし stone   
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whereupon one
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katakana 'no'; whereupon; splitting away from
イチ   イツ   ひと    ひと- one   
コウ   ク   くち mouth   
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コウ   さら again   ふける grow late   ふかす stay up late   
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ニチ   ジツ   sun; day   ひ    -か    
crossed swords
コ   かた hard   かたまる to harden   かためる to make hard   
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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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stick   
box, enclosure   
ケン   かた tough, hard, strict   
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かた hard   
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シン   ジン    subject, retainer   
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また again   
ド   ト   ground; earth   つち ground, earth, soil   
キン    tight, tense, hard   
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シ   いと thread   
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