What is another word for in low tones?
Pronunciation: [ɪn lˈə͡ʊ tˈə͡ʊnz] (IPA) 
In low tones is a phrase used to describe speaking softly or quietly. There are several synonyms that can be used in place of in low tones such as sotto voce, murmuring, speaking under one's breath, whispering, hushed, and subdued. Sotto voce is often used in the context of a private conversation or intimate exchange where one speaks very softly in order to keep the conversation confidential. Murmuring and whispering, on the other hand, relate more to speaking under the breath, while hushed and subdued are used more broadly to describe a quiet or restrained manner of speaking. Regardless of the synonym, using low tones allows for a level of intimacy and discretion in conversations.
