unsubstantiated
Not supported by evidence or facts
Examples
In a meeting
“These are unsubstantiated claims—we need data before making any decisions.”
Over coffee
“That's an unsubstantiated rumor until someone provides proof.”
Why this word
unproven
Unsubstantiated emphasizes lack of supporting evidence, while unproven merely means not yet demonstrated to be true
unsupported
Unsubstantiated is more formal and emphasizes absence of factual backing, while unsupported is general about lacking support of any kind
baseless
Unsubstantiated neutrally states lack of evidence, while baseless implies the claim is unfounded or without merit
Usage tip
Use to challenge claims lacking evidence. More precise than 'unproven' as it emphasizes the absence of support.
Etymology
Latin 'un' (not) + 'substantiatus' (having substance)
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Related words
substantiate
To provide evidence to support or prove the truth of a claim.
substantiated
To provide evidence or proof for a claim
empirical
Based on observation or experience rather than theory
probative
Serving to test, prove, or demonstrate something, especially as evidence
specious
Superficially plausible but actually wrong or deceptive
corroborate
To confirm or give support to a statement, theory, or finding.