Adjective
1. not in good condition; damaged or decayed;
"an unsound foundation"2. not sound financially;
"unsound banking practices"3. containing or based on a fallacy;
"fallacious reasoning""an unsound argument"4. suffering from severe mental illness;
"of unsound mind"5. physically unsound or diseased;
"has a bad back""a bad heart""bad teeth""an unsound limb""unsound teeth"6. of e.g. advice
7. in deplorable condition;
"a street of bedraggled tenements""a broken-down fence""a ramshackle old pier""a tumble-down shack"