IPA: /dɪˈtɪə.ri.ə.tɪv/
KK: /dɪˈtɪrɪəˌreɪtɪv/
Causing something to become worse or to decline in quality.
The deteriorative effects of pollution can be seen in the environment.
Deteriorative → It is formed from "deteriorare" (meaning to make worse) and the suffix "-ive" (meaning having the nature of). The word "deteriorative" describes something that has the nature of making things worse or causing deterioration.
Think of something that 'makes worse' ('deteriorare') — that's why 'deteriorative' refers to something that causes decline or worsening.