Both Uses

ambiguous
in
The Things They Carried
(Auto-generated)

they carried it on their backs and shoulders-and for all the ambiguities of Vietnam, all the mysteries and unknowns, there was at least the single abiding certainty that they would never be at a loss for things to carry.
Chpt 1 *

ambiguities = things that are unclear
You can't tell where you are, or why you're there, and the only certainty is overwhelming ambiguity.†
Chpt 7

ambiguity = lack of clarity -- unclear because there could be two or more interpretations

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".