Mentally ill and Wacky

Mentally ill adjective - Suffering from severe mental illness.

Wacky and mentally ill are semantically related in sane topic. In some cases you can use "Wacky" instead an adjective phrase "Mentally ill".

Wacky adjective - Different from the ordinary in a way that causes curiosity or suspicion.

Mentally ill and wacky are semantically related in sane topic. Sometimes you can use "Mentally ill" instead an adjective "Wacky".