You describe something as sickening when it gives you feelings of horror or disgust, or makes you feel sick in your stomach. This was a sickening attack on a pregnant and defenceless woman
{f} make ill, infect with a sickness; fall ill, become infected with a sickness; nauseate, cause queasiness; become queasy, feel nauseous; cause disgust; be disgusted
get sick; "She fell sick last Friday, and now she is in the hospital" make sick or ill; "This kind of food sickens me" upset and make nauseated; "The smell of the foood turned the pregnant woman's stomach"; "The mold ont he food sickened the diners