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In some senses, unbacked is marked as obsolete. Watch for register when choosing this word.
ADJ.
simple
UNBACKED + NOUN
bench, proof
adj
Having no back.
an unbacked bench
Not supported or backed up (by someone or something).
The warlike Wench amongst the Greekes doth stand Vnbackt by Troy, left of her Damsels all, The battery of a thousand swords she bides, Till her yron plates are hew’d off from her sides.
The simple statement, unbacked by any proof but the weight of Ralph’s new authority, brought light and happiness.
Having no (or few) backers.
an unbacked racehorse
a largely unbacked fundraising project
Of an animal: never having been ridden or not accustomed to being ridden; not (currently) being ridden.
[…] like unback’d colts, they prick’d their ears, Advanced their eyelids, lifted up their noses As they smelt music:
[…] a well wayed horse will safely convay thee to thy journeys end, when an unbackt Filly may by chance give thee a fall:
(of a plate) Not having an antihalation backing.
adjective — unsupported by other people
an unbacked bench
WiktionaryThe warlike Wench amongst the Greekes doth stand Vnbackt by Troy, left of her Damsels all, The battery of a thousand swords she bides, Till her yron plates are hew’d off from her sides.
WiktionaryThe simple statement, unbacked by any proof but the weight of Ralph’s new authority, brought light and happiness.
Wiktionaryi Register
In some senses, unbacked is marked as obsolete. Watch for register when choosing this word.