(~s)
1.
If someone speaks in a ~, their voice does not vary at all in tone or loudness and so it is not interesting to listen to.
The evidence was read out to the court in a dull ~.
N-COUNT: usu sing, also in N
2.
A ~ sound or surface does not have any variation in its tone or colour.
He was seen on TV delivering platitudes about the crisis in a ~ voice.
ADJ: usu ADJ n