a tiny bit; a very small amount, often used in set phrases like 一丝不苟 yī​sī​bù​gǒu or 丝毫 sī​háo

(bound form) used as an intensifier in negative sentences to mean in the least or not even a tiny amount, as in 毫不 háo​bù or 毫无 háo​wú

Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings

difference; discrepancy; the result of a subtraction in mathematics