Answer: Destructive
Explanation:
The underlined word in this question is "pernicious".
The adjective "pernicious" is used to describe something that has a harmful effect of influence, especially in a subtle or gradual manner. An example of its use would be: That pernicious comment made everyone attending the lecture very uncomfortable.
Synonyms to pernicious would be: damaging, harmful, dangerous, and hurtful, among others.
