grievous

adj.

[1]	severe , dangerous , grave , heavy , painful , serious , severe , grave , serious , life-threatening , distressing , harmful , damaging , hurtful , acute , wounding
[2]	egregious , heartbreaking , heartrending , awful , flagrant , terrible , outrageous , heinous , dreadful , atrocious , monstrous , appalling , shocking , deplorable , calamitous , lamentable , intolerable , shameful , unbearable
[3]	grave , heavy , weighty
[4]	atrocious , flagitious , monstrous