English Thesaurus

Synonyms of 'inactive'

(adjective) 
Definition
idle
The satellite has been inactive since its launch two years ago.
Synonyms
,
idle
Now the machine is lying idle.
,
dormant
The virus remains dormant in nerve tissue.
, ,
inert
He covered the inert body with a blanket
,
immobile
He remained as immobile as if carved out of rock.
,
mothballed
,
out of service
, ,
abeyant
Opposites
(adjective) 
He has been inactive since last year.
Synonyms
idle
Employees have been idle for almost a month now.
,
unemployed
Have you been unemployed for over six months?
,
out of work
A third of the population is out of work.
,
jobless
One in four people are now jobless in inner areas like Tottenham.
,
unoccupied
Portraits of unoccupied youths predominate.
,
kicking your heels
Opposites
(adjective) 
They certainly were not politically inactive.
Synonyms
lazy
I was too lazy to learn how to read music.
,
passive
He took a passive role in the interview.
,
slow
Island life is too slow for her liking.
, ,
dull
We all feel dull and sleepy between 1 and 3pm.
,
low-key (informal)
,
sluggish
feeling sluggish and lethargic after a big meal
,
lethargic
He felt too miserable and lethargic to get dressed.
,
sedentary
A sedentary lifestyle has been linked with a risk of heart disease.
,
indolent
indolent teenagers who won't lift a finger to help
,
somnolent
the somnolent villages of Sicily
,
torpid
He led a lazy, torpid life at the weekends.
,
slothful (formal)
He was not slothful: he had been busy all night.
Opposites

Additional synonyms

in the sense of dormant
Definition
temporarily quiet, inactive, or not being used
The virus remains dormant in nerve tissue.
Synonyms
lurking,
unrealized,
unexpressed,
in the sense of dull
Definition
not lively or energetic
We all feel dull and sleepy between 1 and 3pm.
in the sense of immobile
Definition
not moving
He remained as immobile as if carved out of rock.
Synonyms
halted,
immobilized,
at a standstill,
unmoving,
like a statue,
immotile

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Video: pronunciation of 'inactive'

Source

Thesaurus for inactive from the Collins English Thesaurus
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