unsound

adj. unhealthy, weak, infirm; faulty, flawed; shaky, unstable

A logical argument is sound if and only ifthe argument is validall of its premises are true.A proof procedure (e.g. natural deduction) of a logical system is sound if it proves only valid formulas (also tautologies). In notation, a logical system is sound if implies .
See more at Wikipedia.org...

Adjective
1. not in good condition; damaged or decayed; "an unsound foundation"
(antonym) sound
(similar) corroded
2. not sound financially; "unsound banking practices"
(antonym) sound
(similar) bad, insecure, risky, high-risk, speculative
(see-also) broken
3. containing or based on a fallacy; "fallacious reasoning"; "an unsound argument"
(synonym) fallacious
(similar) invalid
4. suffering from severe mental illness; "of unsound mind"
(synonym) mentally ill, unstable
(similar) insane
5. physically unsound or diseased; "has a bad back"; "a bad heart"; "bad teeth"; "an unsound limb"; "unsound teeth"
(synonym) bad, unfit
(similar) unhealthy
6. of e.g. advice
(similar) unreliable, undependable
7. in deplorable condition; "a street of bedraggled tenements"; "a broken-down fence"; "a ramshackle old pier"; "a tumble-down shack"
(synonym) bedraggled, broken-down, dilapidated, ramshackle, tatterdemalion, tumble-down
(similar) damaged

(a.)
Not sound; not whole; not solid; defective; infirm; diseased.
  

adj.
1. defective
ناقص, خراب, عيب دار, عيبي, کھوٹا, کچا, خام, نکما
2. sickly
مريض, ناساز, بيمار, روگي, ناتواں, ناتندرست, کمزور, کسلمند? عليل
3. not orthodox
بے دين, نا راسخ الاعتقاد, مذہب کا کچا
4. deceitful
مکار, دغا باز, بے ايمان, بد نيت, غير معتمد, کپٹي
5. not close
ڈھيلا, بکھرا, عليحدہ, جدا, الگ الگ
6. erroneous
باطل, غير صحيح, نادرست, فاسخ, بناؤٹي, غير حقيقي, مصنوعي, مشتبہ, غلط
7. not strong
جو مضبوط نہ ہو, غير معقول, غير مدلل, ناقابل قبول, بودا
8. not fast
اچاٹ, پراگندہ, منتشر
9. not well established
ناقابل اعتبار, غير معتمد
unsound mind
ناقص عقل, عقل ميں فتور, نشٹ بدھي