"assertive voice" is a correct and usable expression in written English.
You can use it to describe a confident or authoritative tone that someone uses when speaking or writing. For example, "The senator spoke in a clear and assertive voice about the pressing need for immigration reform."
She has a reputation as a blunt-speaking, assertive voice for strong environmental policies, particularly health-related clean air policies.
Bernard Holland, in The New York Times, praised her "clear, assertive voice," adding that she "looked the perfect Octavian".
"I see them, but it could have been different… [his usually assertive voice trails off] it could have been different".
At the center of it all is Mr. O'Brien's small but assertive voice, articulating lyrics marked equally by whimsy and wariness.
Earlier last year, this same assistant principal observed me and instructed me to prioritize improving my "assertive voice" in the classroom.
Make the bear aware of your presence by speaking in an assertive voice, singing, clapping your hands, or making other noises.
In the 1960s, Carthy and the Watersons were at the heart of the original English folk revival - so it's not surprising that Eliza, now 29, has become one of the clearest, most assertive voices in promoting, defining and defending the English song tradition.
Your friendly-assertive voice is the one that's always calm and courteous but never gives in.
In a pack, it is naturally assumed that loud, strong and over-assertive voices mean a negative effect.
The style echoes Mr. Ellis's easygoing but assertive instrumental voice, informed by his studies in North Carolina, New Orleans and New York.
It's only in The Hunt, a new all-male work by Robert Battle, that we see a confidently assertive new voice.
