1. 
   Imputably
   Im·put'a·bly adverb By imputation.
   Found op http://www.encyclo.co.uk/webster/I/26
   
   
2. 
   Imputably
   • (adv.) By imputation.
   Found op http://thinkexist.com/dictionary/meaning/imputably/
   
   
3. 
   imputably
   imputably 1. By imputation. 2. Capability of being imputed; chargeable; ascribable; attributable.
   Found op http://www.wordinfo.info/words/index/info/view_unit/1803/4
   
   
4. 
   imputably
   1) Attributively
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/imputably/1
   
   

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