na-adjective, noun which may take the genitive case particle 'no', noun
Describes something that is whole, flawless, or lacking nothing. Used as a noun, adjectival noun (na-adjective), or prenominal (no-adjective).
彼の計画は完全だった。
His plan was perfect.
完全な
A complete solution has not yet been found.
この書類は完全に間違っている。
This document is completely wrong.