気き分ぶん次し第だい

noun, noun which may take the genitive case particle 'no'

depending on one's mood; as one feels like

Used when a decision or action is based on how one feels at the moment, often implying a lack of fixed plan or principle.

• 今日きょうの予よ定ていは気き分ぶん次し第だいで決きめよう。

  Let's decide today's plans depending on how we feel.

• 彼かれのやる気きは気き分ぶん次し第だいだ。

  His motivation depends on his mood.