adj.单调的，呆板的，沉闷的

The toneless speaker made it difficult to understand the intended emotion behind their words.
没有语调的说话者使得理解他们话语背后的情感变得困难。
She read the poem in a flat, toneless voice that drained it of all its beauty.
她用平淡无奇、没有语调的声音朗读诗歌，使其失去了所有美感。
The customer service representative answered with a toneless "hello" that gave no indication of warmth or willingness to help.
客服代表以一个毫无感情色彩的“你好”应答，没有表现出丝毫的热情或乐于助人的态度。
His toneless apology failed to convey any sincerity, leaving the listener unconvinced.
他那没有语调的道歉未能传达出任何诚意，让听者不信服。
The automated message was delivered in a monotonous, toneless voice that felt utterly impersonal.
自动化信息以单调、无语调的声音传达，感觉非常没有人情味。
Despite her best efforts, the actor's delivery remained toneless, robbing the lines of their intended impact.
尽管她尽了最大努力，但演员的台词仍然缺乏语调，使台词失去了预期的冲击力。
The AI's response was swift but toneless, lacking the empathetic inflections a human would provide.
人工智能的回应迅速却无情感，缺少人类会提供的那种充满同理心的语调变化。
The toneless announcement echoed through the empty hall, creating an eerie atmosphere.
那没有语调的通告在空荡荡的大厅中回响，营造出一种怪异的气氛。
The meditation guide spoke in a soft, toneless manner, encouraging a state of calm detachment.
冥想导师以柔和而无起伏的语调说话，鼓励达到一种平静超然的状态。
The recording of the speech played back in a strange, toneless version due to a technical glitch.
由于技术故障，演讲的录音播放回来时变成了奇怪的、没有语调的版本。