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Definition of malignant

malignant

/məˈlɪɡ.nənt/
ma · lig · nant

Adverb:malignantly
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malignant Lexical Profile

malignant Game Scores & Validity

• adjective

1

(Of a tumor or disease) tending to invade normal tissue, metastasize, or recur after removal; cancerous and potentially fatal.

Example

"Early screening allowed the oncologist to detect and remove the malignant cells before they could spread."


2

Disposed to cause harm, suffering, or distress deliberately; feeling or showing intense ill will or hatred.

Example

"The investigation uncovered a malignant campaign of disinformation aimed at undermining public trust."

Synonyms
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Antonyms
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Word Nuance & Usage

In medical contexts, 'malignant' is the direct opposite of 'benign' and specifically describes cancerous tumors capable of invading surrounding tissues. In general usage, it is closely related to 'malign' (which is more common as a verb meaning to slander, though also used as an adjective meaning harmful).

• Rhymes for malignant

Word Origin & Etymology

Borrowed in the 16th century from Late Latin 'malignans', the present participle of 'malignare' (to act maliciously), derived from 'malignus' (ill-disposed, literally 'born badly'), combining 'malus' (bad) and the root of 'gignere' (to beget).

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Malignant. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/malignant
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