unsound


un·sound

adjective \-ˈsand\

: not based on truth or logic : not showing good judgment

: poorly built or in bad condition

Full Definition of UNSOUND

:  not sound: as
a :  not healthy or whole <an unsound horse>
b :  not mentally normal :  not wholly sane <of unsound mind>
c :  not firmly made, placed, or fixed <structurally unsound>
d :  not valid or true :  invalid, specious <unsound beliefs>
un·sound·ly \-ˈsan(d)-lē\ adverb

Examples of UNSOUND

  1. The roof is structurally unsound.
  2. <disgruntled relatives tried to prove that the woman was of unsound mind when she made her will>

First Known Use of UNSOUND

14th century

un·sound

adjective \-ˈsand\   (Medical Dictionary)

Medical Definition of UNSOUND

: not sound: as a : not healthy or whole <an unsound limb> <an unsound horse> b : not mentally normal : not wholly sane <of unsound mind> c : not fit to be eaten <unsound food>
un·sound·ness noun

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