‘艰涩’ (jiān sè) is an adjective describing language, writing, or ideas that are difficult to understand due to complexity, obscurity, or lack of clarity. It combines ‘艰’ (jiān), meaning ‘difficult’ or ‘arduous’, and ‘涩’ (sè), meaning ‘astringent’ or ‘unsmooth’—literally evoking the sensation of dryness or resistance in the mouth, metaphorically extended to mental effort required to process dense or poorly expressed content.

This word is commonly used for academic texts, philosophical treatises, legal documents, or overly technical explanations where vocabulary is rare, syntax is convoluted, or logical connections are unclear. It carries a mildly negative connotation—not just ‘hard’, but unnecessarily opaque or lacking fluency. Unlike neutral terms like ‘difficult’, ‘艰涩’ implies stylistic or communicative failure rather than inherent subject-matter difficulty.