toneless

adj.

单调的；沉闷的；声调平板的；无音调的

adv.

声调平板地；

1. I tried to be open-minded about the rock concert, but the music was at best loud and at worst toneless.
   对这场摇滚音乐会我要尽量思想开放些，但是其乐声充其量响度很高，更糟糕的是很不悦耳。

Stevens' Toneless Poetry
Toneless telemetry in a wireless system
Tone or Toneless: The Prosody of Mandarin Filled Pauses
Toneless Voices of the Dark Continent: A “Diabolus in Voce” for Women?
On the Funtion of Toneless words′Discerning Acceptation
Yorùbá Films and the Problem of Toneless Orthography
Tone and syntax in Rutooro, a toneless Bantu language of Western Uganda
Hidden morpheme boundaries in Kabiye: A source of miscues in a toneless orthography
The emergence of postcyclic prosody in loanword integration: Toneless Latinate adjectives in Serbo-Croatian
Method for bridging over toneless voice pauses during a telecom link with subscribers connected via a digital network causes a voice...