For something that's very harmful, especially a tumor that's cancerous, use the term malignant.
Disposed to do harm, inflict suffering, or cause distress; actuated by extreme malevolence or enmity; virulently inimical; bent on evil; malicious.
Adjective S.
extremely malevolent or malicious; "the malignant tongues of gossipers"
Adjective
dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor)
a.
Disposed to do harm, inflict suffering, or cause
distress; actuated by extreme malevolence or enmity; virulently
inimical; bent on evil; malicious.
a.
Characterized or caused by evil intentions; pernicious.
a.
Tending to produce death; threatening a fatal issue;
virulent; as, malignant diphtheria.
n.
A man of extrems enmity or evil intentions.
n.
One of the adherents of Charles L. or Charles LL.; -- so
called by the opposite party.
Malignant
A malignant and a turbaned Turk.2.
Some malignant power upon my life.
Something deleterious and malignant as his touch.3.
Malignant
Disposed to do harm, inflict suffering, or cause distress; actuated by extreme malevolence or enmity; virulently inimical; bent on evil; malicious.
A man of extrems enmity or evil intentions.
Usage Examples
At a time when unbridled greed, malignant aggression, and existence of weapons of mass destruction threatens the survival of humanity, we should seriously consider any avenue that offers some hope.
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Other Usage Examples