UNSOUND

adj. 1 weak, feeble, frail, rickety, shaky, ramshackle, infirm, unstable, wobbly, tottering, unsteady, broken-down, crumbling, disintegrating, dilapidated, defective, imperfect, faulty, decayed, rotten The building inspector condemned the structure as unsound and unsafe 2 unhealthy, diseased, ill, afflicted, in poor health, ailing, sickly, sick, unwell, delicate, injured, wounded The attack of flu left him unsound in wind and limb 3 insane, mad, psychotic, unbalanced, unstable, demented, deranged The doctors said that she was still of unsound mind and ought not be released 4 illogical, faulty, flawed, fallacious, untenable, invalid, groundless, unfounded, erroneous, defective, specious We thought that his arguments were unsound, so we rejected his recommendations