Components
すまない is an exact match with one form of the following word:
すまない
BOOST
1. inexcusable; unjustifiable; unpardonable  (often written with kana only)
2. sorry; remorseful; apologetic; conscience-stricken; contrite
expression
3. excuse me; (I'm) sorry; thank you  (see also: 済みません)
Informal form of すみません.
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My current mastery of すまない:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 6 (among the 15,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 77,968 which gives a rank of 9,387
すまない is the most useful form. 1 additional form is shown below.
• This form is used about 60% of the time
• Google Japan frequency rank: 68,000 (about 4,950,000 results)
• This form appears in Wikipedia's list of JLPT N2 vocabulary (see JLPT collections)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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See also:
See also: すみません  
Example sentences:
わたし
じぶん
自分
まちが
間違
すまなく
おも
っている

I'm sorry about my mistake.
たせて
すまなかった
I am sorry to have kept you waiting.
これ
もんだい
問題
げんいん
原因
なったからメールじゃなくて
めん
かって
あやま
らないで
すまないでしょう
This was the cause of the problem, so you should apologize face-to-face, not in an email.
済まない
BOOST
Reading : すまない   
My flashcards:
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Usefulness and usage:
• This form is used about 40% of the time
• Google Japan frequency rank: 74,000 (about 4,000,000 results)
• This form appears in Wikipedia's list of JLPT N1 vocabulary (see JLPT collections)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
VIEW INFLECTIONS
サイ   finish   す to be finished   すます to be through with   
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セイ    equal   
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katakana 'no'; whereupon; splitting away from
ニ   ふた    ふた two   
stick   
ブン   モン    literature   ふみ a letter   
スイ   みず water   
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