プログレッシブ和英中辞典(第4版)の解説
がいけん【外見】
(an) outward appearance；looks ⇒がいかん（外観）
外見は立派な男だ
He is an impressive-looking man.
人は外見では分からない
You cannot judge people 「by their looks [by appearances].
外見ばかり繕っている
All he cares about is (keeping up) appearances.
外見上は
to all appearances
そとみ【外見】
彼は外見には正直者だ
He is honest 「in appearance [to all appearances].
あの人は外見と内とでは大違いだ
He looks totally different from what he really is.