ambiguousyoudaoicibaDictYouDict[ambiguous 词源字典]
ambiguous: [16] Ambiguous carries the etymological notion of ‘wandering around uncertainly’. It comes ultimately from the Latin compound verb ambigere, which was formed from the prefix ambi- (as in AMBIDEXTROUS) and the verb agere ‘drive, lead’ (a prodigious source of English words, including act and agent). From the verb was derived the adjective ambiguus, which was borrowed directly into English. The first to use it seems to have been Sir Thomas More: ‘if it were now doubtful and ambiguous whether the church of Christ were in the right rule of doctrine or not’ A dialogue concerning heresies 1528.
=> act, agent[ambiguous etymology, ambiguous origin, 英语词源]
haltyoudaoicibaDictYouDict
halt: English has two words halt. By far the older, meaning ‘lame’ [OE], has virtually died out as a living part of English vocabulary except in the verbal derivative halting ‘stopping and starting uncertainly’. It came from a prehistoric Germanic *khaltaz, which also produced Swedish and Danish halt ‘Jame’. Halt ‘stop’ [17], originally a noun, comes from German halt, which began life as the imperative form of the verb halten ‘hold, stop’ (a relative of English hold).
=> hold
uncertain (adj.)youdaoicibaDictYouDict
c. 1300, "of indeterminate time or occurrence," from un- (1) "not" + certain (adj.). Meaning "not fully confident" is recorded from late 14c. (implied in uncertainty). Related: Uncertainly.