Sickening

• (a.) Causing sickness; specif., causing surfeit or disgust; nauseating. • (p. pr. & vb. n.) of Sicken
Found on http://thinkexist.com/dictionary/meaning/sickening/

Sickening

Sick'en·ing adjective Causing sickness; specif., causing surfeit or disgust; nauseating. -- Sick'en*ing*ly , adverb
Found on http://www.encyclo.co.uk/webster/S/98

Sickening

Sickening is slang for unpleasant.
Found on http://www.probertencyclopaedia.com/browse/ZSA.HTM
No exact match found