noun
speech impediment; speech disorder
Medical/clinical term for a condition affecting the ability to produce speech sounds correctly or fluently. 'Lalopathy' is a rare technical synonym.
彼は発話障害のため、言葉をはっきり発音するのが難しい。
Because of his speech impediment, he has difficulty pronouncing words clearly.
発話
Support from a speech-language pathologist is important for treating speech disorders.