challenging task

a hard nut to crack a mountain to climb a tough nut to crack ambitious be a pig to do, play, etc. be no picnic be too hot to handle be too much for someone challenge daunting easy give someone a run for their money have your work cut out have your work cut out for you intractability

الصعوبة والمتاعب والإزعاج السهولة والتفاهة والسطحية