His plan was perfect.
完全な解決策はまだ見つかっていない。
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.
He completely understood the plan.
This isn't a perfect solution.
The two sets of data matched perfectly.
完全 means flawless or perfect, focusing on a defect-free state, while 全面的 focuses on the scope and totality of an action or commitment.
完全 means 'perfect' or 'complete', the direct opposite of 不完全, which means 'imperfect' or 'incomplete'.
部分的 means incomplete or only in part, while 完全 means complete or perfect.
perfect number
full version; complete edition; unabridged edition