line drawing
US /ˈlaɪn ˌdrɔːɪŋ/
UK /ˈlaɪn ˌdrɔːɪŋ/

1.
a drawing consisting of lines without shading or color
:
•
The artist created a beautiful line drawing of the landscape.
•
The book was illustrated with simple line drawings.
a drawing consisting of lines without shading or color