1) Alarming 2) Awful 3) Calamitous 4) Dire 5) Dread 6) Dreaded 7) Dreadful 8) Fearful 9) Fearsome 10) Frightening 11) Horrendous 12) Horrific 13) Like a bad omen 14) Terrible Found on https://www.crosswordclues.com/clue/direful
direful 1. Causing fear, dread, or terror. 2. Dreadful; awful; terrible. 2. Indicating trouble: 'The economist indicated direful forecasts for future investments.' Found on http://www.wordinfo.info/words/index/info/view_unit/3856/