無定bô-tiānn副詞副詞說不定。這站仔山頭攏烏陰烏陰,無定明仔早起會變天。Tsit-tsām-á suann-thâu lóng oo-im-oo-im, bô-tiānn bîn-á-tsá-khí ē piàn-thinn.這陣子山頭都烏雲密佈,說不定明天清晨就變天了。類義凡勢huān-sè拍算phah-sǹg無定著bô-tiānn-tio̍h無的確bô-tik-khak檢采kiám-tshái反義一定it-tīng定著tiānn-tio̍h定規tīng-kui