freehand
free-hand
adjective
Done by hand without the aid of instruments or mechanical guides.
"She made a freehand sketch."
noun
A drawing or design created solely by hand, without tools or guides.
"The architect showed a quick freehand."
adverb
Without the aid of instruments or mechanical guides; using only the hand.
"He drew the line freehand."
Thesaurus
Synonyms: original, freehanded