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.
頭脳明晰な人だ。
A person with a sharp, clear mind.
高齢でも意識は明晰だった。
Despite being elderly, the person's mind was lucid.
彼女の論理は常に明晰で、聞いている人を納得させる力がある。
Her logic is always lucid and has the power to convince those listening.
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. Sometimes written as 明析 as a simplification, though this is technically non-standard.