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Definition of malignity : 1. Extreme evilness of nature or influence; perniciousness; heinousness; as, the malignity of fraud.
2. The state or quality of being malignant; disposition to do evil; virulent enmity; malignancy; malice; spite.
3. Virulence; deadly quality.

Synonyms:

deadliness, acrimony, hate, severity, sharpness, nastiness, attitude, malevolence, poisonousness, acerbity, viciousness, bitterness, moroseness, meanness, harshness, spitefulness, malevolency, hatred, ill will, asperity, hostility, causticity, malignancy, sourness, venomousness, virulence, fatality, tartness, maliciousness, unkindness, malignance, malice, resentment, despitefulness, spite, envy

Usage examples:

• Varney had a habit of so representing himself,- of dwelling with a bitter eloquence, which his natural malignity made forcible, on the injustice of the world to superior intellect. - "Lucretia, Complete", Edward Bulwer-Lytton.
• But in the Papal organization we find a scrutiny which penetrated all secrets, a despotism that ironed reason and conscience, an ambition that grasped heaven and earth, a malignity that blasted for time and eternity- a policy in which all the elements of bigotry, terror, malice, duplicity and obduracy were incorporated in their most frightful proportion. - "Monks, Popes, and their Political Intrigues", John Alberger.
• Accept the unbelievable malignity of Iago- and you do accept it before you have proceeded far- and every step of the appalling chain of intrigue seems a natural outcome of the motives of the persons before us. - "Tragedy", Ashley H. Thorndike.