Here are some possibilities:
If you're talking about someone who speaks in a vague or unclear way:
* Нерешительный говорящий (nereshitel'nyy govoryashchiy) - "Hesitant speaker"
* Нечленораздельный говорящий (nechlenorazdel'nyy govoryashchiy) - "Inarticulate speaker"
* Неясный говорящий (neyasnyy govoryashchiy) - "Unclear speaker"
* Медленный говорящий (medlennyy govoryashchiy) - "Slow speaker"
If you're talking about someone who speaks excessively without meaning much:
* Болтун (boltun) - "Chatterbox"
* Балабол (balabol) - "Blabbermouth"
* Пустомеля (pustomelya) - "Empty talker"
If you're talking about someone who speaks with their mouth open in an exaggerated way:
* Говорящий с открытым ртом (govoryashchiy s otkrytym rtom) - "Speaking with an open mouth"
To get a more accurate translation, please provide more context about what you're trying to say.