Unreactive (5)

I believe the answer is:

inert

'unreactive' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for inert that I've seen before include "Devoid of motion or change" , "Chem. non-reactive" , "Motionless, still" , "like neon" , "Chemically unreactive" .)

I've seen this clue in The Mirror, The Telegraph, the Sydney Morning Herald, The New York Times and The Sun.

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