extremely harmful
The pernicious influence of drugs destroyed the community.
Vocabulary like pernicious appears on the Digital SAT in Words-in-Context questions, where you choose the word that fits a passage's meaning and tone. You can also drill this word with vocabulary flashcards.
imperious; offensively self-assured or given to exercising usually unwarranted power
enduring; lasting three seasons or more
having extremely high standards; a feeling that anything less than perfect is unacceptable
treacherous; tending to betray
inattentive; hasty and without attention to detail; not thorough
outside; on or near an edge or constituting an outer boundary; the outer area
lying while under oath; criminal offense of making false statements under oath
possible to fill or pass through; allowing fluids or gases to pass or diffuse through