欠乏

1. Origins, structure, and basic meaning

• Structure: 欠乏 (けつぼう) is shortage below a needed level. It appears with a resource and a physiological need.
• Basic usage: Drinking-water shortage grows serious at sea; prolonged lack of sleep impairs concentration.

2. Common pitfalls and similar expressions

• Shortage of survival resources and sleep deficiency
  • 飲み水の欠乏 is external resource; 睡眠の欠乏 is bodily need. It means insufficiency relative to requirement.