From Longman Dictionary of Contemporary Englishfreehandfree‧hand /ˈfriːhænd/ adjective [only before noun] AVDRAWdrawn by hand without using any special toolsfreehand drawing/sketch —freehand adverb
Examples from the Corpus
freehand• Instead of copying coats of arms, she drew and painted freehand.• But she was, sitting in the parlor and drawing freehand on a large tablet.• a freehand sketch• These can be brought into continuous curves by freehand softening of the joints. 