What is another word for unsound?

Need synonyms for unsound? Here's a list of words from our thesaurus that you can use instead.

Not based on sound or reliable evidence or reasoning
“Even when his conclusions are unsound he often attempts to derive them from Scriptural based premises.”
Not firm
“It had walls, but the beams within were mostly rotten, the roof had gone, it was structurally unsound and the site was entirely overgrown.”
Not healthy or well
“Whether or not such person forgot to have his apple a day will always be up for debate but the fact of the matter is that, yes, such perversions have to be the result of unsound mental health.”
Not being in agreement with what is true
“… an unsound and pernicious stereotype.”
Not using or following good reasoning
“… it is clearly unsound to argue that just because a scientific explanation for that phenomenon does not currently exist, no such explanation is possible.”
Temporarily suffering from a disorder of the body
“… an unsound horse that will have to be disqualified from the race.”
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