| Noun | 1. | undertone - a quiet or hushed tone of voice; "spoke in undertones"tone, tone of voice - the quality of a person's voice; "he began in a conversational tone"; "he spoke in a nervous tone of voice" | |
| 2. | undertone - subdued emotional quality underlying an utterance; implicit meaningmeaning, substance - the idea that is intended; "What is the meaning of this proverb?" | |
| 3. | undertone - a pale or subdued colortint, shade, tincture, tone - a quality of a given color that differs slightly from a primary color; "after several trials he mixed the shade of pink that she wanted" | |