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Found one definition 

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

    
                
                  
     [ichi1]  [news1]  [nf16]  熟, 熟熟, 熟々,  [ichi1]  [news1]  [nf16]  つくづく, つくつく
(adjectival nouns or quasi-adjectives (keiyodoshi))
 (adverb (fukushi))
    

             Note: word usually written using kana alone
         Note: onomatopoeic or mimetic wordcompletely, really, thoroughly, deeply, severely, intently