English Thesaurus

Synonyms of 'arbitrary'

(adjective) 
Definition
not done according to any plan or for any particular reason
Arbitrary arrests were common.
Synonyms
random
The order of events seemed totally random.
, , , , ,
inconsistent
You are inconsistent and unpredictable.
,
erratic
the erratic nature of our recent weather
,
discretionary
They were given wider discretionary powers.
, ,
fanciful
fanciful ideas about Martian life
, , ,
capricious
capricious mood swings
Opposites
(adjective) 
Definition
without consideration for the wishes of others
the arbitrary power of the autocratic state
Synonyms
dictatorial
He suspended the constitution and assumed dictatorial powers.
,
absolute
the doctrine of absolute monarchy
, , ,
autocratic
They have grown intolerant of his autocratic ways.
,
dogmatic
His dogmatic style deflects opposition.
,
imperious
She gave him a witheringly imperious look.
,
domineering
They are not domineering parents.
,
unrestrained
There was unrestrained joy on the faces of the people.
,
overbearing
an arrogant and overbearing man
,
tyrannical
Tyrannical dictators rarely last for long.
,
summary
The four women were acquitted after a summary trial.
, ,
despotic
The country was ruled by a despotic tyrant.
,
high-handed
He wants to be seen as less bossy and high-handed.
,
peremptory
He treated his colleagues in a peremptory manner.
,
tyrannous

Additional synonyms

in the sense of absolute
the doctrine of absolute monarchy
in the sense of autocratic
They have grown intolerant of his autocratic ways.
in the sense of capricious
Definition
having a tendency to sudden unpredictable changes of attitude or behaviour
capricious mood swings

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Video: pronunciation of 'arbitrary'

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Thesaurus for arbitrary from the Collins English Thesaurus
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