difficult in WordNet English dictionary

1. not easy; requiring great physical or mental effort to accomplish or comprehend or endure
   "a difficult task"; "nesting places on the cliffs are difficult of access"; "difficult times"; "why is it so hard for you to keep a secret?"
   difficult  hard 
   
2. hard to control
   "a difficult child", "an unmanageable situation"
   unmanageable  difficult