disgusting adj.

c. 1600, "have a strong distaste for or repugnance to," from French desgouster "have a distaste for" (16c.), from desgoust "distaste," also "strong dislike" (see disgust (n.)).

The sense has strengthened over time in English, and subject and object have been reversed; the older use looks like this: "It is not very palatable, which makes some disgust it" (1660s). The reverse sense of "to excite nausea and loathing in" is attested from 1640s. Related: Disgusted; disgusting.