- 苦 adjectivebitterhaving a sharp, pungent taste like that of coffee or unsweetened cocoa; the opposite of 甜
- 不 adverbnotNegative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings
- 唧 adverb[onomatopoeia]Describes low sounds such as chirping, sighing, or whispering; now usually written as 叽