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Definition of unsound

unsound

/ʌnˈsaʊnd/
un · sound
Adverb:unsoundly
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unsound Lexical Profile

unsound Game Scores & Validity

• adjective

1

Not based on reliable evidence, solid reasoning, or valid principles; flawed or ill-founded.

Example

"The committee rejected the proposal because it relied on financially unsound assumptions."

2

In poor physical condition; structurally weak, damaged, or unsafe.

Example

"Engineers declared the old wooden bridge structurally unsound after the severe flooding."

3

Not in good physical or mental health; unwell or impaired (especially in the legal phrase 'of unsound mind').

Example

"The court ruled that the testator was of unsound mind when the final will was signed."

Synonyms
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Antonyms
View all antonyms for unsound

• Rhymes for unsound

• Nearby Words

unsophisticated
unsorted
unsought
unsound
unsoundly
unsoundness
unsourced

Word Origin & Etymology

From Old English 'unsund', meaning unhealthy or unwell, formed from the privative prefix 'un-' and 'sund' (sound, healthy, or whole).

Cite this Entry

Wordmom. (2026). Definition of Unsound. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/unsound
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