'尤甚' is an adverb meaning 'even more so' or 'especially severe', used to emphasize a heightened degree of a quality or condition—typically something negative like pain, severity, or intensity. The character 尤 means 'particularly' or 'especially', while 甚 means 'to a great extent' or 'extremely'; together they form a compact, literary expression that intensifies the preceding adjective or clause. It often appears in formal writing, medical reports, or classical-style prose, and is rarely used in casual speech.

This term commonly modifies adjectives (e.g., 严重, 突出, 明显) or verbs indicating states (e.g., 表现, 发作), usually following the word it modifies or appearing at the end of a clause. Because it carries a formal, somewhat solemn tone, it’s frequently found in contexts involving illness, social problems, or natural disasters—where gravity and escalation are central themes. Learners should note that 尤甚 never stands alone as a predicate; it always functions as a modifier within a larger descriptive structure.