Thesaurus.com
Dictionary.com
Definitions

unsound

[uhn-sound] / ʌnˈsaʊnd /
ADJECTIVE
not well; flimsy
Synonyms
STRONGEST
defective erroneous false faulty flawed fragile illogical inaccurate incorrect insane insecure shaky unbalanced unhealthy unreliable unsafe unstable
WEAK
ailing crazed dangerous decrepit delicate demented deranged diseased fallacious frail ill in poor health incongruous infirm insubstantial invalid lunatic mad not solid rickety specious tottering unbacked unhinged unsteady unsubstantial unwell weak wobbly
Antonyms
STRONGEST
accurate balanced certain correct firm healthy honest just perfect protected rational reasonable reliable right safe sane secure sound stable steady strong sure true valid well

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

There were fears parts of the Grade II listed Big Mill in Leek could collapse after the building was assessed on Saturday as being structurally unsound.

From BBC

In a court filing, Suno said that claim is “legally unsound.”

From The Wall Street Journal

Germany is uniquely neurotic about debt and about unsound money.

From BBC

She’s right about that, but this manual included some unsound science.

From The Wall Street Journal

The best way to use this information, he thought, was to buy what appeared to be the sounder mortgage bonds and simultaneously sell the unsound ones.

From Literature

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.