a. | 1. | Quick; swift (to burn). |
1. | Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked. |
Adj. | 1. | pernicious - exceedingly harmful |
2. | pernicious - working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison" |