The most eager to hurt people or cause violence; the cruellest and most violent of all.
Superlative form of 'bloodthirsty,' using the '-est' suffix. This represents the highest degree of the characteristic, a form that became standardized in English by the 17th century.
The superlative form marks the absolute extreme—when writers describe someone as 'the bloodthirstiest dictator,' they're making a bold claim about historical ranking. It's rhetoric at work, choosing words to make judgments about degree and extremity.
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