un backed (adjective) unsound: not well; flimsy
Sinonime: ailing, crazed,
dangerous,
decrepit,
defective,
delicate,
demented,
deranged, diseased,
erroneous,
fallacious,
false,
faulty, flawed,
fragile,
frail,
ill,
illogical, in poor health,
inaccurate,
incongruous,
incorrect, infirm,
insane,
insecure,
insubstantial,
invalid,
lunatic,
mad, not solid, rickety,
shaky,
specious, tottering, unbacked,
unbalanced,
unhealthy, unhinged,
unreliable, unsafe,
unstable, unsteady, unsubstantial, unwell,
weak, wobbly
Antonime: safe,
sound,
stable,
strong,
well