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What is another word for unsound?

What's another word for unsound? | Here's a list of synonyms for unsound.

Definition 1: not sound financially - [adjective denoting all]

Definition 1: not in good condition; damaged or decayed - [adjective denoting all]

Definition 1: suffering from severe mental illness - [adjective satellite denoting all]

Definition 1: containing or based on a fallacy - [adjective satellite denoting all]

Definition 1: physically unsound or diseased - [adjective satellite denoting all]

Definition 1: of e.g. advice - [adjective satellite denoting all]