What does 内面 mean?
内面 is a Japanese noun meaning “inside; interior” in English. It can also be translated as “(within) one's mind” depending on context. It is written as 内面 in kanji, ないめん in hiragana, and naimen in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
内面の欠点はきっと外面に現れるものだ。
The inside defects never fail to express themselves outwardly.