1.
lucid, clear, clear-headed
Describes a mind, thinking, or logic that is sharp, clear, and well-organized. Often used to praise someone's intellectual clarity.
明晰 is a na-adjective describing clarity and sharpness of thought, logic, or consciousness. It is a formal, literary word.
Common collocations
- 頭脳明晰: having a sharp, clear mind (the most common usage)
- 意識が明晰: consciousness is clear/lucid
- 論理が明晰: logic is clear and precise
- 明晰な判断: clear-headed judgment
Forms
- Adverbial: 明晰に (clearly, lucidly)
- Noun form: 明晰さ (lucidity, clarity)
Register
A formal, literary word. In everyday speech, 頭がいい or 頭が切れる convey a similar idea more naturally.
Writing
The kanji 晰 is rarely encountered outside this word. 明析 (with 析) is a common miswriting, not an accepted variant.