un·backed /ˌʌnˈbækt/
(a.)無靠背的,未馴服的,無助的,無支援的
Un·backed a.
1. Never mounted by a rider; unbroken. “Unbacked colts.”
2. Not supported or encouraged; not countenanced; unaided.
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unbacked
adj : unsupported by other people [syn: single-handed, unassisted]