freehand
/ˈfriːhænd/adjective & adverb
- (especially with reference to drawing) done manually without the aid of instruments such as rulers（尤指绘画不借助尺子等工具）凭手画的（地）, 徒手画的（地）：
as adj. a freehand sketch一张徒手画的草图
as adv. the pictures should be drawn freehand.这些画需要徒手绘制。