- undertone - a quiet or hushed tone of voice; "spoke in undertones"
--1 is a kind of tone, tone of voice
- undertone, undercurrent - subdued emotional quality underlying an utterance; implicit meaning
--2 is a kind of meaning, substance
- undertone, tinge - a pale or subdued color
--3 is a kind of shade, tint, tincture, tone
- undertone, undercurrent - subdued emotional quality underlying an utterance; implicit meaning