IPA: //ʌnˈstrʌk.tʃərd//
KK: /ʌnˈstrʌk.tʃɚd/
Not having a clear or organized structure; lacking a formal arrangement or system.
The workshop was unstructured, allowing participants to explore their ideas freely.
Unstructured → It is formed from "un-" (meaning not) and "structured" (from Latin "structura", meaning a building or arrangement). The word "unstructured" means not arranged or lacking a defined structure.
Think of 'not' ('un-') having a 'building' or 'arrangement' ('structura') — that's why unstructured means lacking a clear arrangement.