difficult rubber stamp

ambition ambitious arduous assist assistance backbreaker bothersome burdensome challenging crucial demanding difficile difficult difficulty effort effortful exacting formidable galling gargantuan hard hardwon heavy help herculean icon immense intricate irritating labored laborious level need onerous operose painful perseverance persevere problem problematic prohibitive rigid rubber severe situation stamp stiff strenuous symbol test titanic toilsome tough troublesome trying unyielding uphill upstream wearisome