光彩|こうさいkousai[0]heiban (flat)

1. nounbrilliance; splendour; splendor; lustre; luster

• Synonym輝きかがやきNeutralThe everyday word for radiance or glow; also figuratively a person's sparkle. 「光彩」 leans written and often appears in 「光彩を放つ」.
• Synonym光輝こうきWrittenWritten word for brilliant light, also figuratively glory or honour; 「光彩」 stresses beautiful lustre and standing out.
• Synonym精彩せいさいWrittenWritten word for vivid colour and vitality; mostly seen in 「精彩を欠く」, meaning to lack life or vigour.
• Related彩りいろどりNeutralColour arrangement or garnish — about colour rather than brightness, as in 「料理の彩り」.
• Related色合いいろあいNeutralA shade or hue of colour, also figuratively a flavour or feel; carries no sense of dazzling light.
• Related色艶いろつやNeutralColour and sheen, mostly for skin or hair; unlike 「光彩」, not used figuratively for outstanding talent.
• Antonym陰りかげりNeutralShading or dimming, often a sign of decline, as in 「景気に陰りが見える」; the opposite of 「光彩」.
• Antonym曇りくもりNeutralCloudy weather or fogging on glass and mirrors; figuratively a gloomy mood — the opposite of bright 「光彩」.
• Antonym暗黒あんこくNeutralPitch darkness; figuratively a hopeless, bleak future — the opposite of dazzling 「光彩」.

For everyday radiance, 「輝き」 is the default; 「光彩」 is more written, as in 「光彩を放つ」 for standing out brilliantly. Use 「彩り」 for colour arrangement and 「精彩を欠く」 for lacking vitality; 「陰り」「曇り」「暗黒」 are the opposites.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 美うつくしい輝かがやき。
2. 優すぐれた面めんがよく目立めだつこと。