Venomous, poisonous; malignant.

Venomous; bitter.

Malignant, malicious, spiteful.

figurative. Chiefly of temper, feelings, etc.: Virulent, malignant, embittered.

Of a person: full of moral poison, evil; having a corrupting influence; malevolent; = poisonous, adj. 2. Obsolete.

Resembling that of aconite; relating to or of the nature of aconite. Chiefly figurative and in figurative contexts.

transitive. To envenom.