不甚 is an adverb meaning 'not very' or 'not particularly', used to soften or downplay the degree of an adjective or verb. It consists of 不 (bù, 'not') and 甚 (shèn, 'very; extremely'), so literally 'not extremely'. Though classical in origin, it remains common in modern formal and literary Chinese — especially in writing, speeches, or polite conversation — where it conveys restraint and modesty.

This phrase typically precedes adjectives (e.g., 不甚清楚, 不甚满意) or verbs (e.g., 不甚了解), but never nouns. It carries a slightly refined, understated tone — more formal than 没那么 or 有点儿, and less emphatic than 完全不 or 根本不. Learners should note that 不甚 is rarely used in casual spoken Mandarin among young people; it’s more frequent in news reports, official documents, or thoughtful personal expression.