inert

Something that's unable to move or moving without much energy can be described as inert. Wind up in a body cast and you’ll find yourself not only itchy, but totally inert.

When motion is restricted or sluggish, or when something or someone appears lifeless, the adjective to use is inert. A dog who's playing dead is inert, as is a really boring movie. Or for those of you paying attention in chemistry class, you may have heard of inert gases — those elements that won't react with other elements or form chemical compounds.

Primary Meanings of inert

1.
adj
unable to move or resist motion
2.
adj
having only a limited ability to react chemically; chemically inactive
Full Definitions of inert
1

adj unable to move or resist motion

Synonyms:
nonmoving, unmoving
not in motion

adj slow and apathetic

“she was fat and inert
Synonyms:
sluggish, soggy, torpid
inactive
not active physically or mentally
2

adj having only a limited ability to react chemically; chemically inactive

inert matter”
Synonyms:
indifferent, neutral
unreactive
(chemistry) not reacting chemically

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