仮面

1. Origins, structure, and basic meaning

• Structure: 仮面(かめん) is a mask covering the face or an outward appearance concealing inner feelings.
• Basic usage: It is used for festival masks and a composed manner that conceals anxiety.

2. Common pitfalls and similar expressions

• Outer appearance and inner feeling
  • 冷静さという仮面 compares outward composure to a mask. The anxiety hidden beneath it contrasts the actual feeling with the manner shown to others.