'Unsound' definitions:

Definition of 'unsound'

(from WordNet)
adjective
Not in good condition; damaged or decayed; "an unsound foundation" [ant: sound]
adjective
Not sound financially; "unsound banking practices" [ant: sound]
adjective
Containing or based on a fallacy; "fallacious reasoning"; "an unsound argument" [syn: fallacious, unsound]
adjective
Suffering from severe mental illness; "of unsound mind" [syn: mentally ill, unsound, unstable]
adjective
Physically unsound or diseased; "has a bad back"; "a bad heart"; "bad teeth"; "an unsound limb"; "unsound teeth" [syn: bad, unfit, unsound]
adjective
Of e.g. advice

Definition of 'Unsound'

From: GCIDE
  • Unsound \Un*sound"\, a. Not sound; not whole; not solid; defective; infirm; diseased. [1913 Webster] -- {Un*sound"ly}, adv. -- {Un*sound"ness}, n. [1913 Webster]

Synonyms of 'unsound'

From: Moby Thesaurus