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"unsupported" is also used as a crossword clue. If that's what you saw, the answer is often unbacked (8 letters).
Definitions
not held up or borne
Word origin
From Middle English unsupported, equivalent to un- + supported.
Used in a sentence
“The bombed bridge was left unsupported and soon collapsed.”
“This makes it the thinnest unsupported gold ever created and it could be used in electronics and medical devices going forward.”
“This obsolete software is unsupported. Please upgrade to the latest version.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Without backing”11 letters
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