intractable  
  ()(がた)

(1) 形容詞 :

Difficult to handle or control. Not easily governed, managed, or directed.  Can refer to a problem that is very difficult to solve.

〔問題などが〕解決困難な、手に負えない、扱いにくい、厄介な


  • An intractable problem was apparently solved by the team of engineers tasked with the mission.  

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