Pronunciation: (am-big'yOO-us),[key] —adj. 1. open to or having several possible meanings or interpretations; equivocal: an ambiguous answer. 2. Ling.(of an expression) exhibiting constructional homonymity; having two or more structural descriptions, as the sequence Flying planes can be dangerous. 3. of doubtful or uncertain nature; difficult to comprehend, distinguish, or classify: a rock of ambiguous character. 4. lacking clearness or definiteness; obscure; indistinct: an ambiguous shape; an ambiguous future.