Synonyms: unsound
Definition: of e.g. advice
Similar words: undependable, unreliable
Definition: not worthy of reliance or trust
Usage: in the early 1950s computers were large and expensive and unreliable; an undependable assistant
Definition: physically unsound or diseased
Usage: has a bad back; a bad heart; bad teeth; an unsound limb; unsound teeth
Similar words: unhealthy
Definition: not in or exhibiting good health in body or mind
Usage: unhealthy ulcers
Synonyms: mentally ill, unsound, unstable
Definition: suffering from severe mental illness
Usage: of unsound mind
Similar words: insane
Definition: afflicted with or characteristic of mental derangement
Usage: was declared insane; insane laughter
Synonyms: unsound
Definition: not sound financially
Usage: unsound banking practices
Similar words: high-risk, risky, speculative, bad
Definition: not financially safe or secure
Usage: a bad investment; high risk investments; anything that promises to pay too much can't help being risky; speculative business enterprises
Similar words: long
Definition: involving substantial risk
Usage: long odds
Similar words: wildcat
Definition: outside the bounds of legitimate or ethical business practices
Usage: wildcat currency issued by irresponsible banks; wildcat stock speculation; a wildcat airline; wildcat life insurance schemes
Synonyms: unsound
Definition: not in good condition; damaged or decayed
Usage: an unsound foundation
Similar words: corroded
Definition: eaten away as by acid or oxidation
Similar words: decayed, rotted, rotten
Definition: damaged by decay; hence unsound and useless
Usage: rotten floor boards; rotted beams; a decayed foundation
Synonyms: unsound, fallacious
Definition: containing or based on a fallacy
Usage: fallacious reasoning; an unsound argument
Similar words: invalid
Definition: having no cogency or legal force
Usage: invalid reasoning; an invalid driver's license