difficultIt's very difficult to find a job in this city.
hardThe exam was really hard.
complicatedThe instructions were so complicated I just couldn't follow them.
trickyIt's quite tricky getting the puzzle pieces to fit together.
awkwardLuckily, she didn't ask any awkward questions.
demandingShe has a very demanding job.
challengingThis has been a challenging time for us all.
easier said than doneI know I should stop smoking but it's easier said than done.