Quality control is a strategy to ensure the quality of the manufactured product. The egregious QC failure led to a change in the supplier.
Egregious is a term that defines the horrific and conspicuously terrible behavior that includes the neglect of the work. Equivocal means ambiguous or questionable things.
Ebullient is a term that describes the cheerful and joyful nature that is full of energy and makes the person lively and, emollient describes the soft skin. Effulgent portrays a bright and radiant personality.
Therefore, the correct blank is egregious.
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