freehand

徒手画的；不用仪器画的英释中释adjdrawn by hand without using any special tools

徒手画地英释中释advFreehand is also an adverb

1 freehand sketch,徒手画的草图

1 ...freehand sketches.....徒手画的草图。

2 Use a template or stencil or simply do it freehand..用一个模板或模具，抑或索性徒手画。