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Flyblown
Negative Connotation
The word 'flyblown' often implies a strong feeling of disgust, especially when relating to food. 
Visual Imagery
'Flyblown' can conjure up vivid mental images of food swarming with flies, heightening its unappeasable nature. 
Not Just Literal
While 'flyblown' suggests literal contamination by flies, it can also describe any food perceived as disgustingly inedible. 