不定 Traditional form: 不定 Pinyin (reading): bùdìng Definitions: indefinite indeterminate (botany) adventitious Characters: 不 - no, not, un-; negative prefix 定 - to decide, to fix, to settle; to order; definite, fixed, sure Traditional characters: 不 - no, not, un-; negative prefix 定 - to decide, to fix, to settle; to order; definite, fixed, sure