透徹

1. Origins, structure, and basic meaning

• Structure: 透徹 is read とうてつ and expresses clarity of thought or penetrating insight.
• Basic usage: It is a literary expression for lucid reasoning or deep insight into matters such as human psychology.

2. Common pitfalls and similar expressions

• Form before a noun
  • In 透徹した洞察, した describes the quality of the insight. Here した need not simply describe an action completed in the past.
• Not physical transparency
  • When used of logic or insight, 透徹 does not mean that an object is see-through. Distinguish it from 透明 in descriptions of physical transparency.