English Thesaurus

Synonyms of 'volatile'

(adjective) 
Definition
(of circumstances) liable to sudden change
There have been riots before and the situation is volatile.
Synonyms
changeable
He was a man of changeable moods.
The forecast is for changeable weather.
,
shifting
,
variable
Weather conditions are variable and change from day to day.
,
unsettled
Despite the unsettled weather, we had a marvellous weekend.
,
unstable
The situation is unstable and potentially dangerous.
, ,
unreliable
She had proved to be an unreliable witness and had lied to police.
,
unsteady
His unsteady relationship with his flatmates incited him to move out.
,
Opposites
(adjective) 
Definition
(of people) liable to sudden changes of mood and behaviour
She has a volatile temperament.
Synonyms
temperamental
The patient was given to temperamental outbursts and paranoia.
,
erratic
the erratic nature of our recent weather
,
mercurial
his mercurial temperament
,
up and down (informal)
,
fickle
They are fickle, faithless and lewd.
, ,
giddy
At our stage in life we are unlikely to become giddy spendthrifts.
,
flighty
In my youth I was a frivolous fool, vain and flighty.
,
over-emotional
,
Opposites
, , , ,
self-controlled
, ,
cool-headed
(adjective) 
Definition
(of a substance) changing quickly from a solid or liquid form to a vapour
when volatile chemicals explode
Synonyms
,
explosive
Highly explosive gas is naturally found in coal mines.
,
inflammable
A highly inflammable liquid escaped into the equipment.
,
labile (technical)
,
eruptive

Additional synonyms

in the sense of erratic
Definition
irregular or unpredictable
the erratic nature of our recent weather
in the sense of explosive
Definition
able or likely to explode
Highly explosive gas is naturally found in coal mines.
in the sense of fickle
Definition
changeable in purpose, affections, etc.
They are fickle, faithless and lewd.

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Video: pronunciation of 'volatile'

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Thesaurus for volatile from the Collins English Thesaurus
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