keen eyes; piercing gaze; penetrating eyes
Describes sharp, discerning eyes that seem to see through things. Often used in literary or formal contexts.
His keen eyes miss no detail.
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).
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.
Her insightful analysis solved the problem.
Standard kanji spelling; the character 炯 means 'bright' or 'clear'.
Variant form using 烱, a less common character for the same meaning.
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.