Meaning & use
insubstantial vs unsubstantial
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Meanings
adjectivenot comparable
Not strong, solid, or real; lacking substance or importance.
Grammar: Used to describe things that are flimsy or not substantial. It is not usually used in the comparative or superlative.
Patterns
- insubstantial evidence
- insubstantial meal
- insubstantial argument
The evidence against him was insubstantial, so the case was dismissed.
The soup was warm but insubstantial, leaving me hungry an hour later.
Her objections were insubstantial and easily answered.
adjectivenot comparablerare
Rare spelling variant of 'insubstantial'; not having a solid basis or physical presence.
Grammar: This form is rare and often avoided; 'insubstantial' is the preferred spelling.
Patterns
- unsubstantial claims
- unsubstantial evidence
The theory was criticized as unsubstantial and lacking proof.
His unsubstantial income could not support a family.
Common combinations
- insubstantial evidence
- The judge ruled that the insubstantial evidence could not support a conviction.
- insubstantial meal
- We had an insubstantial meal of tea and biscuits.
- insubstantial argument
- His insubstantial argument failed to convince the committee.
- unsubstantial claim
- The company dismissed the unsubstantial claim as a rumor.
Synonyms and how they differ
- flimsy
- Flimsy suggests something easily broken or weak, often physically; insubstantial is broader and can refer to ideas or meals.
- weak
- Weak is a general word for lack of strength; insubstantial often implies a lack of solid content or substance.
- unsubstantial
- A rare variant; using 'insubstantial' is safer and more common.
Opposites
Word family
- substance noun
- The quality of being solid or important; the opposite of insubstantiality.
- substantial adjective
- Large, solid, or important.
- insubstantiality noun
- The state of being insubstantial; rare.
Commonly confused: insubstantial vs unsubstantial or unsubstantial?
insubstantial vs unsubstantial vs unsubstantial
Unsubstantial is a rare variant of insubstantial. Many style guides recommend using insubstantial instead, as unsubstantial is often considered less standard.
Practice
Which sentence uses the standard adjective correctly?
Choose one answer.
Option 0 uses the common adjective 'insubstantial' correctly with a logical result (charges dropped). Option 1 uses the rare variant 'unsubstantial', which is not preferred. Options 2 and 3 are illogical because insubstantial evidence would not lead to increased charges.
Make it your own
Write a sentence using “insubstantial vs unsubstantial”, then check it and compare it with the examples above.