1. extremely severe or harmful in its effects
Usage: often used to describe diseases or poisons
2. bitterly hostile or antagonistic
Usage: used to describe criticism, attacks, or opposition

Examples

• The virulent strain of flu spread rapidly through the school.
• Scientists worked to develop a vaccine against the virulent disease.
• The politician faced virulent criticism from his opponents.
• Her virulent attack on the proposal shocked the committee.
• The virulent poison killed the plant within hours.
• He wrote a virulent letter condemning the new policy.
• The virulent bacteria proved resistant to most antibiotics.