low-keyed

From the bunk house, when he passed, came the murmur of low-keyed voices.

Lucys criticism, spoken in her precise manner, produced a burst of low-keyed laughter.

Her voice was slightly monotonous, but low-keyed: as she spoke her hands clasped and unclasped each other.

Eve de Montalais laughed the charming, low-keyed laugh of a happily diverted woman.