i Register
In some senses, unsound is marked as UK. Watch for register when choosing this word.
unsound
UK /ˌʌnˈsaʊnd/ US /ˌʌnˈsaʊnd/
adj 3
Definitions
adj
1
Not sound
unsound mind
In the ensuing financial panic, many persons sustained heavy losses, and large numbers of unsound schemes succumbed.
2
Not sound
... A horse labouring under a temporary injury, capable of being speedily cured, is not unsound within the meaning of a warranty of soundness ...
3
Not sound
You would not like Nietzsche, sir. He is fundamentally unsound.
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