| adjective | causing fear or anxiety by threatening great harm “a dangerous operation” |
| adjective | causing or marked by grief or anguish “a grievous loss” |
| adjective | of great gravity or crucial import; requiring serious thought “grave responsibilities” |
| adjective | shockingly brutal or cruel “murder is an atrocious crime” |
| dangerousness | noun | the quality of not being safe |
| seriousness | noun | the quality of arousing fear or distress |
| severeness | noun | used of the degree of something undesirable e.g. pain or weather |
| graveness | noun | a manner that is serious and solemn |
| gravity | noun | a manner that is serious and solemn |
| weightiness | noun | the relative importance granted to something |
| weight | noun | the relative importance granted to something |
| atrocity | noun | the quality of being shockingly cruel and inhumane |
| atrociousness | noun | the quality of being shockingly cruel and inhumane |
| monster | noun | a cruel wicked and inhuman person |
| monstrosity | noun | something hideous or frightful |