All 6 Uses

malignant
in
Notes from the Underground
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There in its nasty, stinking, underground home our insulted, crushed and ridiculed mouse promptly becomes absorbed in cold, malignant and, above all, everlasting spite.†
Chpt 1.3
In that case, of course, people are not spiteful in silence, but moan; but they are not candid moans, they are malignant moans, and the malignancy is the whole point.†
Chpt 1.4
In that case, of course, people are not spiteful in silence, but moan; but they are not candid moans, they are malignant moans, and the malignancy is the whole point.†
Chpt 1.4 *
His moans become nasty, disgustingly malignant, and go on for whole days and nights.†
Chpt 1.4
And of course he knows himself that he is doing himself no sort of good with his moans; he knows better than anyone that he is only lacerating and harassing himself and others for nothing; he knows that even the audience before whom he is making his efforts, and his whole family, listen to him with loathing, do not put a ha'porth of faith in him, and inwardly understand that he might moan differently, more simply, without trills and flourishes, and that he is only amusing himself like that from ill-humour, from malignancy.†
Chpt 1.4
"Anyway, in a year you will be worth less," I continued malignantly.†
Chpt 2.6

Definitions:

(1) (malignant)
harmful or evil

in medicine: harmful growth as with a cancerous tumor
(2) (meaning too rare to warrant focus)