IPA: /ɪn.dɪsˈtɪŋkt.li/
KK: /ɪnˈdɪs.tɪŋkt.li/
In a way that is not clear or easy to see or hear.
She spoke indistinctly, making it hard for us to understand her.
Indistinctly → It is formed from "in-" (meaning not) and "distinct" (from Latin "distinctus", meaning separated or distinguished) and the suffix "-ly" (meaning in a manner). The word "indistinctly" means in a manner that is not clear or not easily distinguished.
Think of 'not' ('in-') being added to 'distinct' which means clear or separate, so 'indistinctly' means something that is not clear.