English Thesaurus

Synonyms of 'substantial'

(adjective) 
Definition
of a considerable size or value
That is a very substantial improvement in the current situation.
Synonyms
big
Australia's a big country.
,
significant
It is the first drug that seems to have a significant effect on this disease.
,
considerable
We have already spent a considerable amount of money on repairs.
,
goodly
He spent a goodly part of his life in America.
,
large
In a large room about a dozen children are sitting on the carpet.
,
important
an important economic challenge to the government
,
generous
a room with a generous amount of storage space
, ,
tidy (informal)
The opportunities are there to make a tidy profit.
,
ample
The design gave ample space for a good-sized kitchen.
,
sizable or sizeable
Opposites
(adjective) 
Definition
solid or strong
those fortunate enough to have a fairly substantial property to sell
Synonyms
solid
I stared up at the square, solid house.
,
sound
a perfectly sound building
,
sturdy
The camera was mounted on a sturdy tripod.
,
strong
Around its summit, a strong wall had been built.
,
firm
Use a firm platform or a sturdy ladder.
,
massive
a massive steam boat
,
hefty
The gritty foursome took turns shouldering the hefty load every five minutes.
,
durable
Fine bone china is strong and durable.
,
bulky
a bulky man with balding hair
,
well-built
The suspect is well built, of medium height, and with dark hair.
Opposites
(adjective) 
Definition
available to the senses
(formal)  talk of imminent and substantial progress
Synonyms
real
his first real job
,
true
Everything I had heard about him was true.
,
positive
There was no positive evidence.
,
material
the material world
,
actual
They are using local actors or the actual people involved.
,
valid
Both sides have made valid points.
,
weighty
Surely such weighty matters merit a higher level of debate?
Opposites

Additional synonyms

in the sense of actual
Definition
existing in reality or as a matter of fact
They are using local actors or the actual people involved.
Synonyms
verified,
dinkum (Australian, New Zealand, informal)
in the sense of ample
Definition
more than sufficient
The design gave ample space for a good-sized kitchen.
in the sense of bulky
Definition
very large and massive, esp. so as to be unwieldy
a bulky man with balding hair
Synonyms
big,
mega (slang),
very large,
massy,
ginormous (informal),
humongous or humungous (informal)

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Video: pronunciation of 'substantial'

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Thesaurus for substantial from the Collins English Thesaurus
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