Synonyms of inert

inert

adjective

i-ˈnərt 

1

as in dormant

not being in a state of use, activity, or employment

the inert, abandoned factories that are scattered all over that dying city

Synonyms & Similar Words

• dormant
• off
• vacant
• idle
• unused
• inactive
• dead
• inoperative
• latent
• at rest
• out of commission
• free
• fallow
• useless
• on the shelf
• suspended
• lifeless
• unusable
• unoccupied
• quiescent
• asleep
• comatose
• arrested
• moribund
• interrupted
• slow
• unworkable
• inoperable
• sleepy
• abeyant
• dull

Antonyms & Near Antonyms

• active
• operating
• functioning
• operative
• alive
• on
• busy
• functional
• employed
• working
• operational
• living
• workable
• going
• operable
• industrious
• practical
• running
• useful
• energetic
• vigorous
• viable
• feasible
• usable
• assiduous
• sedulous
• useable

2

as in sleepy

slow to move or act

a sleepy, inert reptile that is no threat to people when left alone

Synonyms & Similar Words

• sleepy
• dull
• inactive
• quiescent
• motionless
• torpid
• lethargic
• sluggish
• lazy
• resting
• static
• inanimate
• listless
• dormant
• apathetic
• indolent
• shiftless
• slothful
• sedentary
• languorous
• still
• asleep
• drugged
• ambitionless
• dead
• slack
• dopey
• comatose
• catatonic
• drowsy
• sluggardly
• lazyish
• dopy
• somnambulant
• sluggard

Antonyms & Near Antonyms

• active
• engaged
• occupied
• busy
• dynamic
• working
• kinetic
• energetic
• vigorous
• vital
• lively
• spirited
• animated
• vivacious
• bouncing
• sprightly
• industrious
• diligent
• perky
• springy
• assiduous
• hardworking
• peppy
• zippy
• sedulous

Synonym Chooser

How is the word inert different from other adjectives like it?

Some common synonyms of inert are idle, inactive, passive, and supine. While all these words mean "not engaged in work or activity," inert as applied to things implies powerlessness to move or to affect other things; as applied to persons it suggests an inherent or habitual indisposition to activity.

inert ingredients in drugs

an inert citizenry

When would idle be a good substitute for inert?

The words idle and inert can be used in similar contexts, but idle applies to persons that are not busy or occupied or to their powers or their implements.

workers were idle in the fields

In what contexts can inactive take the place of inert?

While in some cases nearly identical to inert, inactive applies to anyone or anything not in action or in operation or at work.

on inactive status as an astronaut

inactive accounts

When can passive be used instead of inert?

The words passive and inert are synonyms, but do differ in nuance. Specifically, passive implies immobility or lack of normally expected response to an external force or influence and often suggests deliberate submissiveness or self-control.

passive resistance

When could supine be used to replace inert?

While the synonyms supine and inert are close in meaning, supine applies only to persons and commonly implies abjectness or indolence.

a supine willingness to play the fool

Example Sentences

Recent Examples of inert

Yet there’s something strangely inert about Jay Kelly. —Stephanie Zacharek, Time, 28 Aug. 2025

In these tales, CO2 often seems less like a mute, inert molecule and more like an evil supervillain—a malevolent force that has been plotting for centuries to wreak havoc on our planet and ruin our lives. —Lee Billings, Scientific American, 21 Aug. 2025

Originally supposed to fly Sierra Space Dream Chaser test flight, but payload switched to an inert mass simulator because of potential Dream Chaser delays beyond October launch date. —Richard Tribou, The Orlando Sentinel, 18 Aug. 2025

And yet… something about the world of this Fantastic Four feels inert, not as far from the in-universe Saturday morning cartoon depicting their adventures as filmmaker Matt Shakman and Marvel’s team of writers might think. —Derek Robertson, The Washington Examiner, 8 Aug. 2025