bewildered, confused, puzzled, perplexed, baffled, stumped, mystified, stupefied, nonplussed, muddled, befuddled, fuddled, dumbfounded, at sea, at a loss, at sixes and sevens, thrown, thrown off balance, taken aback, disoriented, disconcerted, discomposed, troubled, discomfited, unnerved, shaken, shaken up, dazed, stunned, astonished, astounded