Undertone definitions

ŭn'dər-tōn'
An underlying or implied tendency or meaning; an undercurrent.
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A tone of low pitch or volume, especially of spoken sound.
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A pale or subdued color.
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A color applied under or seen through another color.
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A low tone of sound or voice.
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A faint or subdued color, esp. one seen through other colors, as in some glazes.
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Any underlying quality, factor, element, etc.

An undertone of horror.

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An implicit message perceived subtly alongside, but not detracting noticeably from, the explicit message conveyed in or by a book, film, verbal dialogue or similar (contrast with overtone); an undercurrent.
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A pale colour, or one seen underneath another colour.
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