IPA: /ˌʌnɪˈlæbəreɪt/
KK: /ʌnɪˈlæbərɪt/
Simple and not detailed; lacking in complexity or richness.
The design of the room was unelaborate, with just a few basic pieces of furniture.
Unelaborate → It is formed from "un-" (meaning not) and "elaborate" (from Latin "elaborare", meaning to work out or develop). The word "unelaborate" means not developed or simple in nature.
Think of 'not' ('un-') making something 'developed' ('elaborate') simpler — that's why unelaborate means simple or straightforward.