Unsystematic and With a mind like a sieve

Unsystematic adjective - Lacking systematic arrangement or method or organization.

With a mind like a sieve and unsystematic are semantically related. In some cases you can use "With a mind like a sieve" instead an adjective "Unsystematic".

Unsystematic and with a mind like a sieve are semantically related. You can use "Unsystematic" instead an adjective phrase "With a mind like a sieve".