1. Irregular strokes: Some calligraphers may have irregular strokes when writing, resulting in irregular shapes or rough looks.
2. Incorrect glyphs: Some calligraphers may have incorrect glyphs when writing, such as writing a wrong word or missing a stroke.
3. Structural confusion: Some calligraphers may be confused when constructing glyphs, such as writing parts of a word too close or too scattered.
4. Stiff lines: Some calligraphers may have stiff lines and lack fluency when writing.
5. Unclear ink: Some calligraphers may have unclear ink when writing, resulting in blurred words.
6. Lack of sense of rhythm: Some calligraphers may lack a sense of rhythm when writing, making the words seem to have no sense of rhythm.
7. Overdecoration: Some calligraphers may overuse decorative strokes, making the characters look too complicated and losing the simplicity and beauty of calligraphy.
These are just some possible situations. Actually, every calligrapher can write ugly words. This is mainly because calligraphy is an art form that requires high skill and artistic sense. Even the best calligrapher may sometimes fail to write such beautiful words.