difficile

ambitious arduous burdensome challenging crucial demanding laborious onerous painful problematic severe strenuous tough troublesome

backbreaker bothersome easier said than done effortful exacting formidable galling gargantuan hard-won heavy herculean immense intricate irritating labored no picnic not easy operose problem prohibitive rigid stiff titanic toilsome trying unyielding uphill upstream wearisome

easy effortless facile helpful nice trivial

calm free friendly manageable plain simple sociable straightforward uncomplicated

arduous complicated heavy rough serious terrible tough troublesome

backbreaking bothersome burdensome demanding distressing effortful exacting fatiguing formidable grinding hairy herculean intricate involved irksome knotty labored laborious mean merciless murder onerous operose rigorous rugged scabrous severe slavish sticky strenuous tiring toilful toilsome unsparing uphill uphill battle wearing wearisome wearying

easy facile

flexible simple