失措

to be at a loss

to lose / to miss / to fail

to handle / to manage / to put in order / to arrange / to administer / to execute / to take action on / to plan

to lose one's head out of fear (idiom)

panic-stricken (idiom) / to be in a flustered state / also written 張惶失措|张惶失措[zhang1 huang2 shi1 cuo4]

at a loss (idiom)

flustered / ruffled / disconcerted

see 驚慌失措|惊慌失措[jing1 huang1 shi1 cuo4]