The synonyms of Unsound are: bad, unfit, fallacious, unstable, rickety, flimsy, shaky, wobbly, pottery, defective, crumbling, decaying, broken, broken-down, damaged, rotten, ramshackle, insubstantial, jerrybuilt, unsafe, unreliable, dangerous, disordered, diseased, deranged, disturbed, troubled, demented, unbalanced, unhinged, insane, crazed, distracted, untenable, flawed, faulty, weak, questionable, dubious, tenuous, suspect, illogical, irrational, unfounded, ungrounded, unsubstantiated, unsupported, specious, hollow, spurious, false, fallible, erroneous, wrong, sophistic, casuistic Not safe or robust; in poor condition.
Casuistic Of or relating to the use of ethical principles to resolve moral problems. Overly subtle casuistic reasoning.
Crumbling Breaking or falling apart into small fragments, especially as part of a process of deterioration. He was trying to escape financial problems and a crumbling marriage.
Decaying Declining in quality, power, or vigor. Disordered Suffering from an illness or condition that disrupts normal physical or mental functions.
Disturbed Afflicted with or marked by anxious uneasiness or trouble or grief. Timeshare has been brought into disrepute by dubious sales methods.
Fallacious Based on an incorrect or misleading notion or information. Fallible Wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings.
False Used in names of plants animals and gems that superficially resemble the thing properly so called e g false oat. Insane In a state of mind which prevents normal perception, behavior, or social interaction; seriously mentally ill.
Irrational Of a number quantity or expression not expressible as a ratio of two integers and having an infinite and non-recurring expansion when expressed as a decimal Examples of irrational numbers are the number and the square root of 2. Rickety Inclined to shake as from weakness or defect.
Shaky Vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze. Specious Based on pretense; deceptively pleasing.
Spurious (of a line of reasoning) apparently but not actually valid. Tottery Unsteady in gait as from infirmity or old age.
Troubled Characterized by or indicative of distress or affliction or danger or need. Unbalanced (of a person) emotionally or mentally disturbed.
Weak Relating to or denoting the weakest of the known kinds of force between particles which acts only at distances less than about 10 cm is very much weaker than the electromagnetic and the strong interactions and conserves neither strangeness parity nor spin. Wobbly (of a line or handwriting) not straight or regular.
Absurdity A message whose content is at variance with reason. The crowd laughed at the absurdity of the clown s behavior.
Disqualify Declare (someone) ineligible for an office, activity, or competition because of an offense or infringement. A heart murmur disqualified him for military service.
Fallible Wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings. Improper Not conforming to legality, moral law, or social convention.
The incongruity of his fleshy face and skinny body disturbed her. Incongruous Lacking in harmony or compatibility or appropriateness.
Irrational Of a number quantity or expression not expressible as a ratio of two integers and having an infinite and non-recurring expansion when expressed as a decimal Examples of irrational numbers are the number and the square root of 2. Irresponsible (of a person, attitude, or action) not showing a proper sense of responsibility.
The increase in the number of unfit and overweight children is alarming. Unjustifiable Incapable of being justified or explained.
She knew she was being unreasonable, but she resented his domesticity. In the early 1950s computers were large and expensive and unreliable.
Unsuitable Not worthy of being chosen (especially as a spouse. Untenable (of theories etc) incapable of being defended or justified.