(idiomatic) Not caring at all, being no skin off one's nose, being of no concern at all.

plain congee

congee (a type of rice porridge)

The hiragana syllable び (bi). Its equivalent in katakana is ビ (bi).

尾: (Chinese astronomy) Tail

尾: tail / 弥: extending / 眉: eyebrows / 美: beautiful / 備: preparation / 媚: obsequious / 微: tiny / 鼻: nose / 靡: to flutter, to wave, to be swayed by

美: beauty / 微: tininess

美: beautiful / 微: tiny

尾: fish, shrimp

鈍: Short for 鈍色.