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WORDNET DICTIONARY

Adjective unreactive has 2 senses

• unreactive(a = adj.all) Array - (chemistry) not reacting chemically; Array
Antonym: reactive

• unreactive(s = adj.all) Array - not tending to react to stimulation; Array

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unreactive

Physical Inertness

N physical inertness, inertness, dullness, inertia, vis inertiae, inertion, inactivity, torpor, languor, quiescence, latency, inaction, passivity, mental inertness, sloth, inexcitability, irresolution, obstinacy, permanence, rare gas, paraffin, noble metal, unreactivity, inert, inactive, passive, torpid, sluggish, dull, heavy, flat, slack, tame, slow, blunt, unreactive, lifeless, dead, uninfluential, latent, dormant, smoldering, unexerted, inactively, in suspense, in abeyance.

For further exploring for "unreactive" in Webster Dictionary Online