Having the quality or tendency to contaminate; causing or capable of causing contamination or pollution.
From contaminate + -ive (suffix forming adjectives meaning 'tending to' or 'having the quality of'). The -ive suffix comes from Latin -ivus and creates descriptive words from verbs.
Factory emissions can have deeply contaminative effects on surrounding areas for generations—decades after a factory closes, soil and water stay poisoned, showing how contamination is like a toxic gift that keeps giving.
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