undoubtedly

ad.不容置疑地，肯定地

undesirable, undesirably, undetectable, undeterred, undeveloped, undid, undies, undignified, undirected, undischarged, undisclosed, undiscovered, undisputed, undistinguished, undisturbed, undivided, undo, undoing, undone, undoubted, undreamed-of, undress, undressed, undrinkable, undue, undulate, undulation, unduly, undying, unearned, unearth, unearthly, unease, uneasily, uneasiness, uneasy, uneatable, uneconomic, uneconomical, uneconomically,