- The definition of pernicious is deadly or very destructive.
An example of pernicious is the devastating effects of intense drug use.
Smokiing is pernicious
- causing great injury, destruction, or ruin; fatal; deadly
- Rare wicked; evil
Origin of perniciousFrench pernicieux ; from Classical Latin perniciosus ; from pernicies, destruction ; from pernecare, to kill ; from per, thoroughly + necare, to kill: see necro-
- Tending to cause death or serious injury; deadly: a pernicious virus.
- Causing great harm; destructive: pernicious rumors.
Origin of perniciousMiddle English, from Old French pernicios, from Latin perniciōsus, from perniciēs, destruction : per-, per- + nex, nec-, violent death; see nek-1 in Indo-European roots.
(comparative more pernicious, superlative most pernicious)
- pernicious anaemia