Scrawl
Part of speech: noun
Definition: An Irregular, possibly illegible handwriting. A hastily, or carelessly written note etc.
Part of speech: verb
Definition: To write something hastily or illegibly. To write in an irregular or illegible manner.
Scribble
Part of speech: verb
Definition: To write or draw carelessly and in a hurryTo doodleTo card or tease coarsely; to run through the scribbling machine.
Part of speech: noun
Definition: Careless, hasty writing or drawing
Example sentence: Many times, the way I write my themes or melodies is that I hear it, and then I sing into my phone or something, or I'll scribble down on a piece of paper.