Merriam-Webster Collegiate Dictionary - ambiguous

 adjective  Etymology: Latin ambiguus, from ambigere to be undecided, from ambi- + agere to drive — more at agent  Date: 1528  1.  a. doubtful or uncertain especially from obscurity or indistinctness eyes of an ~ color  b. inexplicable  2. capable of being understood in two or more possible senses or ways an ~ smile an ~ term a deliberately ~ reply  Synonyms: see obscure  • ~ly adverb  • ~ness noun