Definition of "unreactive" [unreactive]

• Not reactive; relatively inert. (adjective)
• That does not respond to a stimulation. (adjective)

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• "Ramsay from London received the 1904 Nobel Prize for Chemistry for his discovery of a number of noble gases, a new group of chemically unreactive elements."
• "This is at first glance surprising, because of the ease with which one would expect helium with its tiny, light, unreactive atoms to escape from the spaces within the crystal structure."
• "In elemental form it is a dark, amorphous, unreactive solid."