Sentence:  I know, sir, I am no flatterer: he that beguiled you in a plain <WSD>accent</WSD> was a plain knave; which for my part I will not be, though I should win your displeasure to entreat me to 't. 
Meaning of the word marked with <WSD> tags:  (modulation of the voice) Modulation of the voice in speaking; the manner of speaking or pronouncing; a peculiar or characteristic modification of the voice, expressing emotion; tone.