Definify.com
Webster 1913 Edition
Unbacked
Un-backed′
,Adj.
1.
Never mounted by a rider; unbroken.
“Unbacked colts.” Shak.
2.
Not supported or encouraged; not countenanced; unaided.
Daniel.
Webster 1828 Edition
Unbacked
UNBACK'ED
,Adj.
1.
Not having been backed; as an unbacked colt.2.
Not tamed; not taught to bear a rider3.
Unsupported; left without aid.