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?"簡単でない難しい
例:a difficult task 難しい仕事
hard to control; "a difficult child", "an unmanageable situation"なかなか抑えられない気難しい