Griffonage is a term that refers to illegible or careless handwriting. If you're looking for synonyms for this word, there are several options you can use to better express your thoughts. For instance, you can use the word "scrawl" to describe hasty or careless writing, or "scribble" to describe a quick, unrefined handwriting. Another word that is often used as a synonym for griffonage is "chicken scratch". This phrase refers to handwriting that is so messy it resembles the scratches left behind by a chicken's claws. Additionally, you can use the term "doodle" to describe careless drawings made in the margins of a paper.