1) An alarming lack of respect 2) Appalling 3) Atrocious 4) Awful 5) Baleful 6) Bloodcurdling 7) Causing alarm or fear 8) Causing concern 9) Causing disquiet 10) Causing distress 11) Chilling 12) Creepy 13) Creepy-crawly 14) Dire 15) Direful 16) Dismaying 17) Dreaded 18) Dreadful 19) Fearful 20) Fearsome 1) Appalling 2) Bloodcurdling 3) Chilling 4) Creepy 5) Dire 6) Direful 7) Dismaying 8) Disturbing 9) Dread 10) Dreaded 11) Dreadful 12) Fearful 13) Fearsome 14) Formidable 15) Frightening 16) Frightful 17) Ghastly 18) Grisly 19) Gruesome 20) Horrendous 21) Horrible 22) Horrifying 23) Macabre 24) Menacing 
• (p. pr. & vb. n.) of Alarm • (a.) Exciting, or calculated to excite, alarm; causing apprehension of danger; as, an alarming crisis or report. -- A*larm`ing*ly, adv.
A·larm'ing adjective Exciting, or calculated to excite, alarm; causing apprehension of danger; as, an alarming crisis or report. -- A*larm'ing*ly, adv . 
[adj] - causing alarm or fear
adjective causing alarm or fear
causing alarm or fear: an alarming case of pneumonia; an alarming lack of respect.