[{"Bold_text": "adjective", "List Items": ["causing insidious harm or ruin; ruinous; injurious; hurtful:pernicious teachings;a pernicious lie.Synonyms: malicious , noxious , baneful , damaging , destructive , deleterious , detrimental , harmful", "deadly; fatal:a pernicious disease.Synonyms: lethal", "Obsolete.evil; wicked."]}]