Wiktionary
tonelessly
adv. In a toneless manner.
WordNet
tonelessly
adv. in a monotone; "`Come in,' she said tonelessly"
Usage examples of "tonelessly".
Jerry Cruncher hummed to himself tonelessly as he tapped various valves with a small ballpeen hammer, then carefully tightened the gasket retainer on one.
Pran Chole addressed them tonelessly, 'Kron has commanded that I inform you of certain details.
Sandy said tonelessly, and looked at the dead scientist, as if impressing the hideous sight imperishably upon her mind.
Mullen said, tonelessly, I think perhaps I had better have a spare oxygen cylinder.