unsound

[US]/ˌʌnˈsaʊnd/

[UK]/ˌʌnˈsaʊnd/

Frequency: Very High

Translation

adj. lacking in soundness, flawed, unstable
adv. in an unsound manner
n. lack of soundness, flaw

a person of unsound mind

That bridge looks unsound to me.

Don’t listen to unsound advice.

I am afraid that it is an unsound investment.

I had an intuitive conviction that there was something unsound in him.

He escaped a prison sentence by reason of unsound mind at the time the crime was committed.

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