CARD 2 OF 5
pernicious
adjective
Reveal meaning and examples
Seriously harmful, especially in a gradual or less obvious way.
Persistent rumors had a pernicious effect on trust within the group.
A rumor about hidden judging rules began to engender suspicion among members of a photography club. An organizer's sarcastic reply threatened to exacerbate the disagreement instead of answering it. The repeated claim had a pernicious effect on cooperation: members stopped sharing equipment because they no longer trusted one another.