fractious

adjectives

stubbornly resistant to authority or control
"a fractious animal that would not submit to the harness"; "a refractory child"
is derived from
easily irritated or annoyed
"an incorrigibly fractious young man"; "not the least nettlesome of his countrymen"
is derived from
unpredictably difficult in operation; likely to be troublesome
"rockets were much too fractious to be tested near thickly populated areas"; "fractious components of a communication system"
is similar to
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?"