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Found one definition 

  1.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                

    
                
                  
     [ichi1]  [news2]  [nf40]  退屈,  (word containing out-dated kanji)  怠屈,  [ichi1]  [news2]  [nf40] たいくつ
(adjectival nouns or quasi-adjectives (keiyodoshi))
 (noun (common) (futsuumeishi))
 (noun or participle which takes the aux. verb suru)
tedium, boredom

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