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Components
くだらない is an exact match with one form of the following word:
くだらない
BOOST
good-for-nothing; stupid; trivial; worthless  (often written with kana only)
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My current mastery of くだらない:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 5 (among the 10,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 92,247 which gives a rank of 6,232
くだらない 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: 41,000 (about 12,800,000 results)
• This form appears in Wikipedia's list of JLPT N2 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 1594 (see iKnow! collections)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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Example sentences:
こんなくだらない
しつもん
質問
する
ゆうき
勇気
ない
I don't dare ask such a silly question.
わたし
くだらない
ぎろん
議論
まれた

I was involved in a petty argument.
わたしたち
私達
くだらない
ぎろん
議論
まれた

We were involved in a petty argument.
下らない
BOOST
Reading : くだらない   
My flashcards:
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Usefulness and usage:
• This form is used about 10% of the time
• Google Japan frequency rank: 95,000 (about 2,170,000 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
カ   ゲ   した below, under   しも bottom part   もと under (influence)   さげる to lower, to reduce   さがる to be lowered   くだ to descend   くだ to judge   くださる to give   おろす to drop off (passenger)   おりる to get off (train)   
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