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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.

Germany is uniquely neurotic about debt and about unsound money.

From BBC • Mar. 27, 2026

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

From The Wall Street Journal • Feb. 8, 2026

That assessment was technically accurate but fundamentally unsound.

From Slate • Mar. 28, 2025

The surface pleasures of “Y2K” are outlandishly fun, but plot-wise, the film is structurally unsound.

From Los Angeles Times • Dec. 6, 2024

It is the source for this map, though the reader is cautioned against regarding it as either exact or universally accepted. genetically unsound but logically consistent.

From "1491" by Charles C. Mann

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