"ambiguity'' is something that doesn't have a clear meaning. So, it;s not really the same as "doubt". Of course, if something is 'ambiguous' you might have 'doubts' but there are other causes for 'doubt'. .
Yes, quite literal and even literary but I've added it. As long as the meaning is the same we have leeway to include all sentences to aid in understanding.
That's actually an interesting question.
Αμφιβολία (doubt) comes from αμφίβολος (dubious). It is composed by αμφί + βάλλω. Βάλλω means hit, and αμφίβολος literally has the meaning of the one who's being hit from all sides. :P
I find it really interesting to dissect the origins of words, and it makes it easier to learn them too! Do you know of a book or other online resource for Greek word origins?
I used this greek dictionary along with wiktionary. http://www.greek-language.gr/greekLang/modern_greek/tools/lexica/triantafyllides/