Sickening means making you feel ill or disgusted. A sickening blow, a sickening sight, sickening cruelty.
It is used far more of moral disgust than of actual nausea, and a sickening attack is the standard phrase in reporting. Of a sound it means a heavy dull one, as in a sickening crunch.
1adjectivesickeningMaking you feel ill or disgusted.
“There was a sickening smell of rotten meat coming from the bin.”
sickening is a quality.
by surface analysis, sicken + -ing.
Etymology from Wiktionary, CC BY-SA