also: しいにぶ
Rare term for a deep, lustrous black, possibly used in classical or poetic contexts.
The color name 椎鈍 appears in old documents.
Alternate reading しいにぶ, also rare.
The exact derivation is uncertain; the kanji 椎 (chinquapin) and 鈍 (dull) may relate to a dark, muted shade.