Final answer:
The set of words that would most likely appear in a thesaurus entry for synonyms of 'vindictive' is: malicious, vengeful, spiteful.
Step-by-step explanation:
The word 'vindictive' means having or showing a strong or unreasoning desire for revenge. Therefore, a thesaurus entry for synonyms of 'vindictive' would include words that convey a similar meaning. Out of the given sets of words, the set that would most likely appear in a thesaurus entry for synonyms of 'vindictive' is: malicious, vengeful, spiteful.
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