濃い

1. Origins, structure, and basic meaning

• Structure: 濃い, read こい, denotes a strong or dense quality of flavor, color, fog, or similar substance.
• Basic usage: It describes a strong soup flavor diluted with water and thick fog spreading beyond a mountain.

2. Common pitfalls and similar expressions

• Strong flavor and visual density
  • For flavor it means concentrated or strong; for fog or color it means dense and visually deep.