vexed

adjectives

troubled persistently especially with petty annoyances
"harassed working mothers"; "a harried expression"; "her poor pestered father had to endure her constant interruptions"; "the vexed parents of an unruly teenager"
causing difficulty in finding an answer or solution; much disputed
"the vexed issue of priorities"; "we live in vexed and troubled times"
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?"