deleterious

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Adjective[change]

Positive
deleterious

Comparative
more deleterious

Superlative
most deleterious

  1. When something is deleterious, it is harmful; it hurts something; it causes damage.
    She thought quitting school would be a good idea, but it had a deleterious effect on her future.
    His doctor tried to tell him that smoking so much was deleterious to his health, but he would not listen.
    The government's program for "helping" students learn better has been deleterious to both students and teachers.