Kanji 代 substitute, change, convert 稀 rare, phenomenal, dilute (acid) Related words まれ まれ simply means 'rare' or 'uncommon' in frequency, while 希代 emphasizes being exceptionally outstanding and rare across time.
非ひ 凡ぼん 非凡 means 'extraordinary' or 'uncommon' in ability, but 希代 carries a stronger nuance of being historically rare or matchless.
Written forms 希代 Usage 45% i Usage for this spelling across all readings, not one reading alone.
稀代 Usage 55% i Usage for this spelling across all readings, not one reading alone.
きだい
Etymology Compound of 希 (rare, uncommon) and 代 (era, generation), literally 'rare era'. The spelling 稀代 uses the older form of the same character. The reading きだい is a less common variant.
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