The Collaborative International Dictionary of English v.0.48:
Scrawler \Scrawl"er\ (-[~e]r), n. One who scrawls; a hasty, awkward writer. [1913 Webster]WordNet (r) 3.0 (2006):
scrawler n 1: a writer whose handwriting is careless and hard to read [syn: scrawler, scribbler]