thick · kind

1. Origins, structure, and basic meaning

• Structure: 厚 can convey physical thickness or depth of feeling; 厚い is read あつい.
• Basic usage: 厚い本 means a thick book, while 厚い信頼関係 means a relationship of deep trust.

2. Common pitfalls and similar expressions

• The noun for thickness
  • Replacing the ending of 厚い with さ gives the noun 厚さ. 板の厚さ identifies a board's thickness as something to measure.
• Physical thickness and relationships
  • For a book or board, thickness is central; for a trusting relationship, depth and strength of feeling are central. Translate the expression according to its context.