Please give me a rough estimate.
彼は大まかな説明しかしなかった。
He only gave a broad explanation.
generous; openhanded
Describes a person's character as not being stingy or petty; broad-minded and generous. Often used with 性格 or 人柄.
彼は大まかな性格で、細かいことは気にしない。
He has a generous nature and doesn't worry about small details.
I got a rough estimate of the cost of the construction work.
He has a generous, easygoing personality and doesn't worry about small things.
Could you explain the procedure in broad terms?
I divided the materials into three rough groups.
大まか describes a rough, broad-strokes approach, the opposite of the meticulous, point-by-point manner conveyed by 細々.