The answer to the crossword puzzle is 'Dyslexia, ' which is a learning disorder that affects an individual's ability to read, write, and spell. It is caused by a neurological disorder that affects the brain's ability to process language-based information. People with dyslexia often have difficulty with reading comprehension, spelling, and writing. Dyslexia can be a source of character flaws, as it can lead to feelings of frustration, low self-esteem, and difficulty in school.