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virulent

vir·u·lent [ vryələnt, vrələnt ]


adjective 
Definition:
 
1. very poisonous: extremely poisonous, infectious, or damaging to organisms

2. malicious: showing great bitterness, malice, or hostility
virulent criticism

3. irritating: extremely obnoxious or harsh

[14th century. < Latin virulentus "poisonous" < virus "poison, venom"]

vir·u·lent·ly adverb
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