[{"Bold_text": "adjective", "List Items": ["not definitely ascertainable or fixed, as in time of occurrence, number, dimensions, or quality.Synonyms: unsure , unpredictable", "not confident, assured, or free from hesitancy:an uncertain smile.", "not clearly or precisely determined; indefinite; unknown:a manuscript of uncertain origin.Synonyms: undetermined , unsettled", "vague; indistinct; not perfectly apprehended:an abstruse novel with uncertain themes.", "subject to change; variable; capricious; unstable:a person of uncertain opinions.", "ambiguous; unreliable; undependable:Her loyalties are uncertain.", "dependent on chance or unpredictable factors; doubtful; of unforeseeable outcome or effect.", "unsteady or flickering, as light; of changing intensity or quality.Synonyms: irregular"]}]