- a low tone of sound or voice
- a faint or subdued color, esp. one seen through other colors, as in some glazes
- any underlying quality, factor, element, etc.: an undertone of horror
- An underlying or implied tendency or meaning; an undercurrent.
- A tone of low pitch or volume, especially of spoken sound.
- a. A pale or subdued color.b. A color applied under or seen through another color.