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Definition of Unreactive
1. Adjective. (chemistry) not reacting chemically.
Category relationships: Chemical Science, Chemistry, Natural Philosophy, Physics
Similar to: Inactive, Indifferent, Inert, Neutral, Noble, Stable
Antonyms: Reactive
Similar to: Inactive, Indifferent, Inert, Neutral, Noble, Stable
Antonyms: Reactive
2. Adjective. Not tending to react to stimulation.
Similar to: Insensitive
Definition of Unreactive
1. Adjective. (chemistry) Not reactive; relatively inert. ¹
2. Adjective. (psychology) That does not respond to a stimulation. ¹
¹ Source: wiktionary.com