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Use "inflectionless" in a sentence
"Stone narrates, speaking in an inflectionless monotone."
"The voice, when it finally spoke, was inflectionless and personality-free."
"Is he a pompous ass who uses his made-for-drolleries inflectionless delivery to convince people that just naming people "Ole [oh-lee]" makes every stupid thing he says about some way of life that clearly never existed, anywhere, funny?"