IPA: /ˌʌnəˈsaɪnd/
KK: /ʌnəˈsaɪnd/
Not given a specific task or role; not designated for a particular purpose.
The unassigned tasks were left for the team to complete later.
Unassigned → It is formed from "un-" (meaning not) and "assigned" (from Latin "assignare", meaning to designate or allocate). The word "unassigned" means not designated or allocated to a specific person or purpose.
Think of 'not' ('un-') having a specific 'designated role' ('assigned') — that's why unassigned means something that hasn't been designated.