Repugnant refers to something you detest so thoroughly it threatens to make you physically sick, like the idea of marrying your sister. Or wearing last year's jeans.

A repugnant thing is a thing offensive, detestable, or obscene. It can be repugnant to your mind or your morals. It can also be physically repugnant, like the smell that comes from a restaurant’s dumpster, which hasn't been emptied since the very exciting "Omelet Week," way back at the beginning of August. Makes you want to "re-PLUG-nant" your nose!

Definitions of repugnant
  1. adjective
    offensive to the mind
    “morally repugnant customs”
    synonyms: abhorrent, detestable, obscene, repulsive
    unpleasant or disgusting especially to the senses
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