轻微 (qīng wēi) is an adjective meaning 'slight' or 'mild', used to describe something that is barely noticeable, not serious, or low in intensity. The character 轻 means 'light' (in weight or degree), and 微 means 'tiny', 'faint', or 'minute'; together, they emphasize a very small degree of something — especially physical sensations, symptoms, emotions, or effects. It often appears in formal or semi-formal contexts, such as medical reports, news articles, or careful descriptions.

This word commonly modifies nouns like 症状 (symptoms), 疼痛 (pain), 反应 (reaction), or 损伤 (injury). Unlike colloquial alternatives like 有点儿 or 一点点, 轻微 carries a neutral-to-formal tone and implies objective, measurable mildness rather than subjective impression. It is rarely used predicatively without a noun (e.g., you wouldn’t say '他轻微' alone); it typically appears attributively before a noun or in structures like '有轻微…' or '出现轻微…'.