REACTIVE definition: 1. reacting to events or situations rather than acting first to change or prevent something: 2…. Learn more.

The meaning of REACTIVE is of, relating to, or marked by reaction or reactance. How to use reactive in a sentence.

In chemistry, reactivity is the impulse for which a chemical substance undergoes a chemical reaction, either by itself or with other materials, with an overall release of energy. Reactivity refers to: the …

If someone is reactive, they behave in response to what happens to them, rather than deciding in advance how they want to behave. I want our organization to be less reactive and more pro-active.

REACTIVE meaning: 1 : done in response to a problem or situation reacting to problems when they occur instead of doing something to prevent them; 2 : tending to change into something else when …

Dec 27, 2025 · An elevated C-reactive protein level of greater than 3 milligrams per deciliter, signifies increased levels of inflammation and thus increased risk for heart disease.

Dec 4, 2025 · reactive (comparative more reactive, superlative most reactive) That reacts or responds to a stimulus. (chemistry) That readily takes part in reactions.

To be reactive is to be ready to react or respond to something else — as opposed to ready to act on one's own. A person who's reactive does things only in response to others.

REACTIVE definition: tending to react. See examples of reactive used in a sentence.

• We must be reactive rather than proactive, because becoming motivated and taking initiatives involves gaining power. • Many businesses follow a reactive strategy rather than initiating new products.