assertively

From assertive + -ly.

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assertively (comparative more assertively, superlative most assertively)

1. In an assertive manner.
   • 2007 December 1, Allan Kozinn, “That Same Old Beat, With Brand-New Choices”, in The New York Times‎^[1], archived from the original on 17 January 2018:

     Here it was the province of an electronic harpsichordlike timbre (presumably from a laptop) and an electric bass, played assertively by Zach Layton and supported by the drummer, David Justh. Mr. Justh added considerable filigree in the course of the 66-minute performance, none sanctioned by the score, but captivating enough to justify its berth.