unsourced

1 6.3

Not having a named or known source of information

adjective
/ʌnˈsɔrst/

: sin fuente

I might not be a "scientist" per se, but I studied natural and social sciences in undergrad, and one thing that was drilled into me back in college was that someone who cites unsourced "gut impressions" and "reasonable common sense" as evidence in support of their thesis is a charlatan.
unsourced allegations

Examples

Many unsourced statements circulated on social media caused confusion among users.
There is not one shred of evidence presented that the President changed anything, just unsourced speculation created out of nothing.

Blog text (28)
I believe you have been notified that we are issuing a statement in response to your unsourced and unsubstantiated report about Unemployment Insurance claims data.

Blog text (34)
The article was filled with unsourced claims that could not be verified.
Journalists should be cautious about reporting unsourced information that lacks credibility.

Synonyms

unsubstantiated

vsunsourced

38 7.5

Not supported by facts or proof

refers to missing an identified origin rather than lacking proof

unproven

vsunsourced

28 4.9

Not shown to be true or to work

is about lacking a named origin rather than lacking demonstration

unsupported

vsunsourced

9 5.0

Not backed by facts or proof

concerns lacking a known source rather than lacking proof

unverified

vsunsourced

7 5.3

No one has checked it to see if it is true

concerns missing an identified source rather than being unconfirmed

uncorroborated

vsunsourced

6 8.1

Not proved by other facts or evidence

refers to absence of an identified source rather than missing confirmation

unattributed

vsunsourced

1 6.4

A text without a known author or source

is about lacking an identified origin or source

unproved

vsunsourced

1 6.3

No good evidence shows it is true

relates to absence of an identified source rather than proof

untraced

vsunsourced

1 6.9

Not found even after people tried to find it

is about lacking an identified source rather than search failure

unevidenced

vsunsourced

1 8.4

A claim with no facts or proof to show it is true

highlights missing a known origin rather than lack of evidence

unestablished

vsunsourced

1 7.3

Not well known or accepted by many people

focuses instead on lacking a known, stated, or identified source

sourceless

vsunsourced

8.1

Having no known cause or beginning

emphasizes absence of a known source or origin

unattributable

vsunsourced

7.8

Not possible to say who or what it came from

means the same but stresses missing an identified source

unascribable

vsunsourced

9.9

Cannot be traced to any one cause or person

focuses on the absence of a named origin or source

nonspecified

vsunsourced

6.3

Not stated or described in detail

is specifically missing a named origin or source

unattested

vsunsourced

Formal

8.9

No official source or written record confirms it

focuses instead on missing a named origin or source

unfound

vsunsourced

7.2

Not based on facts or evidence

speaks specifically to having no stated origin or source

unsustained

vsunsourced

7.1

Not supported by facts after checking

is about having no identified source rather than failing proof

undemonstrated

vsunsourced

7.2

Not proven to be true by tests or studies

refers specifically to missing an identified origin or source

How Sourced

documented

3.7

attributional

7.7

unsourced

1 6.3

Surface Forms

unsourced positive

Morphology

unsourced = sourced (transparent) = un + source + ed

The adjective 'unsourced' is formed by adding the negative prefix 'un-' to 'sourced', yielding the straightforward meaning 'not sourced'.

Etymology

Unsourced is made from the small part un- ('not') and the word source ('origin' or 'starting place'). Think of a source as the spring where a river begins, so unsourced means something that has no known starting place or origin.