The sound was 'indistinct' [='faint'] at first, then gradually became louder.
Her voice could only be heard 'indistinctly'. [='faintly']
a far-off 'indistinct' light
(..) to these lengths? I don't know. But don't worry. I swore I'd keep you safe, and I will. indistinct announcement over P.A. Linc. Grey. Hello. This is my wife, Anastasia. (..)2018 Fifty Shades Freed