Cacography is bad spelling or punctuation, or poor or illegible handwriting.
Cacography is the opposite of good handwriting. For example, "His cacography was so bad that I could hardly make out a single word in the letter he wrote."
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calligraphy
cacography
Cacography, cacographics
Perhaps you mean Constructional Dyspraxia which is difficulty or inability to sequence letters, numbers, words, sentences, paragraphs, steps, etc.Someone who can't spell is called a cacographer.The term for not being able to spell is cacography.
9-letter wordsbiography, epigraphy, geography, orography10-letter wordsautography, cacography, demography, holography, ideography, kymography, nomography, renography, serigraphy, sonography, telegraphy, tomography, topography, typography, venography, xerography, xylography11-letter wordsangiography, aortography, calligraphy, cartography, chirography, chorography, cosmography, discography, ethnography, filmography, flexography, hagiography, hydrography, iconography, lithography, mammography, mythography, orthography, paleography, petrography, phonography, photography, pictography, planography, pornography, radiography, reprography, scenography, stenography, stylography, uranography, videography12-letter wordsbibliography, biogeography, cardiography, choreography, chronography, cryptography, fluorography, lexicography, lymphography, oceanography, phlebography, physiography, polarography, scintigraphy, seismography, shadowgraphy, stereography, stratigraphy, thermography, zoogeography13-letter wordsarteriography, autobiography, metallography, oscillography, prosopography, spectrography14-letter wordschromatography, cinematography, historiography, paleogeography, phytogeography, pseudepigraphy15-letter wordsantipornography, autoradiography, biostratigraphy, cholangiography, crystallography, encephalography, phototelegraphy, plethysmography, psychobiography, radioautography, radiotelegraphy, roentgenography, semipornography, telephotography, ultrasonography, xeroradiography16-letter wordsastrophotography, echocardiography, electromyography, lymphangiography, macrophotography, microphotography, microradiography, photolithography, photomicrography, rechromatography17-letter wordsangiocardiography, chromolithography, phonocardiography, photofluorography, stereophotography18-letter wordselectrooculography, electrophotography, spectroheliography19-letter wordselectrocardiography, electroretinography22-letter wordselectroencephalography