Find Synonyms
unsound Synonyms
Another word for unsound
Choosing another word for unsound depends on context, so the 24 synonyms and similar words below are separated across 3 exact definitions and ranked by match strength.
• adjective (Context 1)
Not based on reliable evidence, solid reasoning, or valid principles; flawed or ill-founded.
Usage Example
"The committee rejected the proposal because it relied on financially flawed assumptions."
Strongest
flawed
invalid
Strong
fallacious
ill-founded
faulty
unreliable
defective
specious
groundless
• adjective (Context 2)
In poor physical condition; structurally weak, damaged, or unsafe.
Usage Example
"Engineers declared the old wooden bridge structurally unsafe after the severe flooding."
Strongest
unsafe
unstable
Strong
weak
defective
rickety
shaky
dilapidated
fragile
Weak
rotten
• adjective (Context 3)
Not in good physical or mental health; unwell or impaired (especially in the legal phrase 'of unsound mind').
Usage Example
"The court ruled that the testator was of unhealthy mind when the final will was signed."
Strongest
unhealthy
Strong
unwell
impaired
deranged
unbalanced
diseased
infirm
Opposites of unsound
The opposite of unsound shifts depending on context. Common opposites include:
sound
sane
solid
healthy
valid
sturdy
lucid
logical
• Nearby Words
Cite this Entry
Wordmom. (2026). Synonyms for Unsound. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/synonyms/unsound