IPA: /ʌnˈniːdɪd/
KK: /ʌnˈnidɪd/
Something that is not necessary or required.
The extra decorations were unneeded for the simple event.
Unneeded → It is formed from "un-" (meaning not) and "needed" (from the root "need" which comes from Old English "neodian", meaning to require or be necessary). The word "unneeded" means not required or unnecessary.
Think of 'not' ('un-') and 'required' ('needed') — that's why unneeded means something that is not required.