All 3 Uses

ambiguous
in
Dreaming in Cuban
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Lourdes abhors ambiguity.†
Chpt 1.5 *

ambiguity = lack of clarity -- unclear because there could be two or more interpretations
Through the mouths of the cowries the gods speak to him in clear, unambiguous voices.†
Chpt 2.10

unambiguous = clear (not open to multiple interpretations)

standard prefix: The prefix "un-" in unambiguous means not and reverses the meaning of ambiguous. This is the same pattern you see in words like unhappy, unknown, and unlucky.
We agree that his sexually ambiguous days—when he wore white face and black nail polish—were his best.†
Chpt 2.14

Definitions:

(1) (ambiguous)
unclear -- because there could be two or more interpretations
(2) (meaning too rare to warrant focus)
More rarely, ambiguous can mean uncertain or doubtful -- as in the expression "an ambiguous smile".