reactive — English Dictionary

Adjective

1. That reacts or responds to a stimulus.

2. That readily takes part in reactions.

   Examples

   francium is the most reactive of the alkali metals.

3. Characterized by induction or capacitance rather than resistance.

4. Reacting to the past rather than anticipating the future, not predictive.

Adjective

1. participating readily in reactions

   Antonyms

   unreactive

   Examples

   sodium is a reactive metal

   free radicals are very reactive

2. reacting to a stimulus

   Synonyms

   responsive

   Examples

   the skin of old persons is less reactive than that of younger persons