The term 'chemically nonreactive' is often used to describe a substance that does not react with other substances when exposed to them. The crossword solution for this term is 'INERT, ' which means the same thing. INERT substances are not affected by chemical reactions, and they do not react with other substances. This makes them useful in many industrial and scientific applications, such as in the production of pharmaceuticals and in the storage of hazardous materials.