toneless

1. ADJ A toneless voice is dull and does not express any feeling. (聲音)不帶感情的; 不帶感情地[書面] [ADV after v]

2. tonelesslyADV

"That's most kind of him," Eleanor said tonelessly. “他還真好心，”埃莉諾淡淡地說(shuō)。