One way to hold this word: something bad that will not stay where it is. It is not merely unpleasant in itself - it reaches out and damages whatever is near it. Medicine uses that picture for a growth that invades the rest of the body; writers use it for hatred that spreads through a person and out towards other people.
From the word’s history
Wiktionary derives the word from malignant plus -cy, or malign plus -ancy, or Latin malignantia. The adjective malign is the older piece, and it names ill will; the noun simply names the state of being that way, which is why the medical and the human uses sit on one word.
依據來源，這個字可以看成 malignant 加 -cy，或 malign 加 -ancy，也可能直接來自拉丁文 malignantia。比較早的那一塊是 malign，講的是「帶著惡意」。名詞只是把那個狀態說出來。所以醫學的用法和寫人的用法才會共用同一個字。
Wiktionary, entry malignancy (packet source_ref kaikki:3f6f69a190036ae4:1056080045:9049)
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