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Synonyms
del·e·te·ri·ous (dĕĺĭ-tîŕē-əs)

[From Greek dēlētērios, from dēlētēr, destroyer, from dēleisthai, to harm.]

adjective 

Having a harmful effect; injurious: the deleterious effects of smoking.

derivatives

deĺe·téri·ous·ly
adverb
deĺe·téri·ous·ness
noun