An auditory tone of low pitch or volume.

To accompany as an undertone. / To say or speak in an undertone. / To present as less important, noticeable or prominent.

plural of undertone

Third-person singular simple present indicative form of undertone

Not sufficiently toned.

(in combination) Having an undertone of a specified kind.

simple past tense and past participle of undertone

present participle of undertone