substantial

substantial — adjective

1. big in size, amount, or degree, often enough to be noticed or to make a differen

1.adjectiveB2
Definition

big in size, amount, or degree, often enough to be noticed or to make a difference

Example

Ayesha received a substantial pay rise after the project succeeded.

substantial + noun (pay rise)

The storm caused substantial damage to homes along the coast.

Common collocations
  • substantial amount
  • substantial increase
  • substantial difference
  • substantial damage
  • substantial sum
  • substantial improvement
  • substantial portion
Synonyms
  • considerable

    neutral and factual, often used for amounts or degrees without the sense of material weight

  • significant

    emphasises the importance or noticeable effect of something

  • sizeable

    informal synonym, focuses on physical size or amount but less on value

Antonyms
  • insignificant

    too small or unimportant to be worth attention

  • negligible

    so small or unimportant that it can be ignored

Grammar Patterns

substantial + noun (amount, increase, difference, damage)

Usage Note

Often used to describe changes, differences, or effects that are clearly noticeable — not just large but meaningfully so.

Common Mistakes

There was a big substantial amount of money.
There was a substantial amount of money.
'big' and 'substantial' are redundant together.

2. related to the most important or central part of something, rather than small or

2.adjectiveC1
Definition

related to the most important or central part of something, rather than small or secondary details

Example

Though they disagreed on small points, there was substantial agreement on the core plan.

substantial agreement on [topic]

The committee addressed the substantial issues of safety and funding before discussing minor matters.

Common collocations
  • substantial agreement
  • substantial issue
  • substantial matter
  • substantial change
  • substantial difference
  • substantial question
Synonyms
  • essential

    stresses the fundamental nature of something, without which it would not be what it is

  • fundamental

    focuses on being the basis or foundation of something

  • main

    simpler and less formal; indicates the most important part

Antonyms
  • minor

    smaller or less important

  • incidental

    occurring as a minor accompaniment to something else

Grammar Patterns

substantial + noun (agreement, issue, matter, point)

Usage Note

Frequently found in legal, academic, and formal business contexts. Distinguish from sense 1: this sense does not refer to quantity but to importance of content.

Common Mistakes

We had a substantial meal.' (meaning essential).
We discussed the substantial matters first.
'substantial meal' refers to a large meal (sense 1), not an important one.

3. large and strong in physical form; made so that it can last and support weight

3.adjectiveB2
Definition

large and strong in physical form; made so that it can last and support weight

Example

The old farmhouse had substantial stone walls that kept the rooms cool in summer.

substantial + noun describing physical structure

Dario chose a substantial oak table that would last for decades.

Common collocations
  • substantial building
  • substantial wall
  • substantial structure
  • substantial frame
  • substantial piece of furniture
Synonyms
  • sturdy

    emphasises resistance to wear or damage; stronger but less about size

  • solid

    suggests firmness and lack of weak points; more informal

  • heavy-duty

    informal; describes objects designed for hard use

Antonyms
  • flimsy

    weakly made; easily broken or damaged

  • fragile

    easily broken or damaged; delicate

Grammar Patterns

substantial + noun (building, wall, table, structure)

Usage Note

Can describe a person's physical build in a neutral or positive way. Unlike 'sturdy', which focuses on resistance to damage, 'substantial' implies both size and strength.

Common Mistakes

She wore a substantial jacket.' (vague).
She wore a substantial winter coat made of thick wool.
'substantial' works best when the physical qualities (thickness, weight, strength) are clear from context.

4. real and based on facts or evidence, rather than imagined, pretended, or lacking

4.adjectiveC1
Definition

real and based on facts or evidence, rather than imagined, pretended, or lacking solid support

Example

The police gathered substantial evidence linking the suspect to the crime.

substantial evidence

The charity requires substantial proof of need before distributing funds.

Common collocations
  • substantial evidence
  • substantial basis
  • substantial reason
  • substantial proof
  • substantial grounds
Synonyms
  • real

    simpler and more general; can describe anything that actually exists

  • valid

    focuses on logical soundness or legal acceptability

  • concrete

    emphasises being specific and tangible rather than abstract

Antonyms
  • imaginary

    existing only in the mind, not in reality

  • baseless

    having no foundation in fact or reason

Grammar Patterns

substantial + noun (evidence, basis, reason, proof)

Usage Note

Common in formal writing about arguments, claims, and investigations. Distinguish from sense 1: here 'substantial' is about reality and truth, not quantity — a 'substantial amount of evidence' (sense 1) means a lot of evidence, while 'substantial evidence' (this sense) means convincing, solid evidence.

Common Mistakes

She made a substantial excuse for being late.
She provided substantial reasons for her decision.
'substantial' here means well-founded, not merely lengthy or creative.

Word family

Synonym discussion

Sense: adjective/1

Considerable is the most neutral choice for 'large in amount' and is widely used with uncountable nouns such as 'time', 'effort', and 'sum' (a considerable amount of effort). Significant adds the idea of importance or noticeable effect — a significant rise in temperature matters because of its impact. Substantial goes further by suggesting both size and material weight or real value (a substantial investment implies not only a large amount but one that carries real meaning). Sizeable is more informal and focuses mainly on physical size or number (a sizeable crowd). Ample suggests 'more than enough with room to spare' (ample storage space, ample time to finish). Choose substantial when you want to convey that something is not merely large but carries real weight — whether financial (substantial cost), physical (substantial wall), or evidentiary (substantial proof).

considerable ↗significant ↗sizeableample ↗

Common collocations

Nouns

Adverbs

  • fairly substantial
  • quite substantial
  • very substantial
  • most substantial
  • reasonably substantial

Phrases

  • a substantial amount of
  • a substantial number of
  • a substantial portion of
  • a substantial proportion of
  • a substantial part of

Prepositions

  • substantial in
  • substantial for

Etymology

LatinOld FrenchEnglish

Substantial entered English in the 14th century from Old French substantiel, which came from Latin substantiālis, meaning 'pertaining to the substance or essence of something'. The Latin root substantia ('substance, essence') was formed from substāre (sub- 'under' + stāre 'to stand'), literally 'that which stands under' — i.e., the underlying reality of a thing. The word first carried the sense of 'having actual existence' (sense 4 in modern use). By the 15th century it developed the meaning 'of solid construction' (sense 3), and by the 17th–18th centuries it expanded to 'of considerable amount or importance' (senses 1 and 2).