- alarming
- adjdreadful, terrible, grievous, dire; threatening, hazardous, dangerous, perilous; terrifying, frightful, direful, appalling, ominous, portentous; disturbing, distressing, harrowing, rending; redoubtable, fearsome, fearful, formidable, awful; horrible, horrid, horrendous, monstrous; hideous, ghastly, eerie, grisly, gruesome, unspeakable; outrageous, shocking, amazing, startling, surprising.
A Note on the Style of the synonym finder. 2014.