厚い

1. Origins, structure, and basic meaning

• Structure: 厚い is read as あつい and is an i-adjective describing physical thickness or figurative depth in a relationship.
• Basic usage: It can modify a physically thick book or deep trust built through years of cooperation.

2. Common pitfalls and similar expressions

• Physical thickness
  • In 厚い本, it directly contrasts thickness and thinness, corresponding to thick.
• Figurative depth
  • 厚い信頼関係 describes strong, deep trust rather than a measurable thickness.