noun, na-adjective
keen eyes; piercing gaze; penetrating eyes
Describes sharp, discerning eyes that seem to see through things. Often used in literary or formal contexts.
彼の炯眼は、細部まで見逃さない。
His keen eyes miss no detail.
その刑事は炯眼で、小さな証拠も見つけ出す。
The detective has a piercing gaze and finds even the smallest clues.
noun, na-adjective
insightfulness; acumen
Refers to mental sharpness and the ability to grasp the essence of things. Often used in phrases like 炯眼な判断 (keen judgment).
彼女の炯眼な分析が問題を解決した。
Her insightful analysis solved the problem.
慧眼 (けいがん) also means 'keen insight' or 'discerning eye', but is more commonly used than 炯眼 and often implies wisdom or spiritual insight. 炯眼 emphasizes sharpness and penetration, while 慧眼 leans toward enlightened perception.
鋭い (するどい) is a common adjective meaning 'sharp' (for blades, senses, or minds). 炯眼 is a more literary, noun/adjectival noun form specifically for eyes or insight.
From Chinese 炯眼 (jiǒngyǎn), literally 'bright eyes'. The character 炯 means 'bright, shining', and 眼 means 'eye'. The word entered Japanese as a literary term for sharp perception.