This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Not reactive; relatively inert.

adj. That does not respond to a stimulation.

adj. not tending to react to stimulation

adj. (chemistry) not reacting chemically

"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."

insensitive    inert    inactive    indifferent    noble    neutral    stable   

reactive   

unreactivity   

uncreative    underactive   

nonreactive   

polyamide    sea-colored    allochthonous    red-colored    non-failing    large-area    cellulosic    bluff-bowed    non-persistent    illiquid