undulant (adj.) undue (adj.) undressed (adj.) undress (v.) undreamed (adj.) undoubted (adj.) undoubtable (adj.) undone (adj.) undomesticated (adj.) undocumented (adj.) undo (v.) undivulged (adj.) undivided (adj.) undisturbed (adj.) undistinguished (adj.) undistinguishable adj.不能区别的(分辨不清的)undisputed (adj.) undisputable (adj.) undismayed (adj.) undisguised (adj.)