unsound

[ uhn-sound ]
/ ʌnˈsaʊnd /

adjective, un·sound·er, un·sound·est.

not sound; unhealthy, diseased, or disordered, as the body or mind.
decayed or impaired, as timber or foods; defective.
not solid or firm, as foundations.
not well-founded or valid; fallacious: an unsound argument.
easily broken; light: unsound slumber.
not financially strong; unreliable: an unsound corporation.

Origin of unsound

Middle English word dating back to 1275–1325; see origin at un-1, sound2

OTHER WORDS FROM unsound

un·sound·ly, adverb un·sound·ness, noun

Example sentences from the Web for unsound

British Dictionary definitions for unsound

unsound
/ (ʌnˈsaʊnd) /

adjective

diseased, weak, or unstable of unsound mind
unreliable or fallacious unsound advice
lacking solidity, strength, or firmness unsound foundations
of doubtful financial or commercial viability an unsound enterprise
(of fruit, timber, etc) not in an edible or usable condition

Derived forms of unsound

unsoundly, adverb unsoundness, noun