Of unsound mind and Round the bend

Of unsound mind adjective - Not of sound mind, memory, or understanding; in law, not competent to go to trial.

Round the bend and of unsound mind are semantically related in mentally strange topic. In some cases you can use "Round the bend" instead an adjective phrase "Of unsound mind".

Round the bend adjective - Informal or slang terms for mentally irregular.

Of unsound mind and round the bend are semantically related in mad topic. You can use "Of unsound mind" instead an adjective phrase "Round the bend", if it concerns topics such as mentally strange.