| ADVERB | all | insidiously, perniciously | in a harmfully insidious manner |
|---|
| Meaning | In a harmfully insidious manner. | |
|---|---|---|
| Example | "these drugs act insidiously" | |
| Synonym | perniciously | |
| Adjectives | insidious | working or spreading in a hidden / hidden and usually injurious way |
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