倦怠

1. Origins, structure, and basic meaning

• Structure: 倦怠 (けんたい) can mean boredom-induced weariness or bodily lethargy. The examples use the noun and compound 倦怠感.
• Basic usage: Monotonous life produces ennui and a change of environment; long work leaves severe bodily lethargy.

2. Common pitfalls and similar expressions

• Weariness with a lifestyle and physical lethargy remaining
  • 倦怠を覚える is psychological tedium; 倦怠感が残る is a felt bodily state. Distinguish their causes and sensory scope.