also: そとづら
noun
outer surface; outside; exterior
Physical outer surface or exterior of an object.
この箱の外面はとても滑らかだ。
The outer surface of this box is very smooth.
noun
How something looks from the outside, often contrasting with inner reality.
彼は外面は穏やかだが、実は短気だ。
He appears calm on the outside, but he's actually short-tempered.
noun
manner with others; demeanor; outward bearing
Only with reading そとづら
Specifically read そとづら. Refers to one's behavior or attitude shown to others, often with a nuance of putting on a front.
彼は外面がいいから、初対面の人には好かれる。
He has a good manner with others, so people he meets for the first time like him.