noun
depending on circumstances; at one's convenience
Used to indicate that something will happen or be decided based on the situation or one's availability. Often appears in phrases like 都合次第で or 都合次第だ.
参加できるかどうかは、その日の都合次第です。
Whether I can attend depends on my schedule that day.
旅行に行くかは、仕事の都合次第で決めます。
I'll decide whether to go on the trip depending on work circumstances.
Compound of 都合 (circumstances, convenience) and 次第 (depending on). The combination is transparent and follows the productive pattern of noun + 次第.