open to or having several possible meanings or interpretations; equivocal

an ambiguous answer.

Linguistics . (of an expression) exhibiting constructional homonymity; having two or more structural descriptions, as the sequence Flying planes can be dangerous.

of doubtful or uncertain nature; difficult to comprehend, distinguish, or classify

a rock of ambiguous character.

lacking clearness or definiteness; obscure; indistinct

an ambiguous shape; an ambiguous future.

noun

ambiguity , cloudiness , equivocalness , indefiniteness , nebulousness , obscureness , obscurity , uncertainty , unclearness