Longman Dictionary of Contemporary English - sickening

~ adj 1 very shocking, annoying, or upsetting; disgusting  (Local police said it was one of the most sickening attacks they had come across. | their sickening hypocrisy) 2 a sickening thud/crash an unpleasant sound that makes you think someone has been injured or something has been broken  (His head hit the floor with a sickening thud.) 3 BrE spoken making you feel jealous  ("Helen's just bought herself a new BMW." "God, how sickening!") - sickeningly adv