The Oxford Thesaurus An A-Z Dictionary of Synonyms - grievousadj.

1) severe, heavy, painful, grave, serious, distressing, harmful; damaging, hurtful, acute, wounding: The church buildings suffered grievous damage from the storm. He was charged with causing grievous bodily harm. 2) egregious, awful, flagrant, terrible, outrageous, heinous, dreadful, atrocious, monstrous, appalling, shocking, deplorable, calamitous, lamentable, intolerable, shameful, unbearable: Missing that catch was a grievous error.