In a bad way and Unwell

In a bad way adjective - Facing or experiencing financial trouble or difficulty.

Unwell and in a bad way are semantically related in sick topic. In some cases you can use "Unwell" instead an adjective phrase "In a bad way", when it comes to topics like run-down, not healthy.

Unwell adjective - Temporarily suffering from a disorder of the body.

In a bad way and unwell are semantically related in ill topic. You can use "In a bad way" instead an adjective "Unwell".