The quality of a person's voice:
— He spoke in a nervous tone of voice.

synonym: tone.

Roget 580: voice; vocality^†; organ, lungs, bellows; good voice, fine voice, powerful voice etc. (loud) 404; musical voice etc. 413; intonation; tone of voice etc. (sound) 402.    vocalization; cry etc. 411; strain, utterance, prolation^†; exclamation, ejaculation, vociferation, ecphonesis^†; enunciation, articulation; articulate sound, distinctness; clearness, of articulation; stage whisper; delivery.    accent, accentuation; emphasis, stress; broad accent, strong accent, pure accent, native accent, foreign accent; pronunciation.    [Word similarly pronounced] homonym.    orthoepy^†; cacoepy^†; euphony etc. (melody) 413.    gastriloquism^†, ventriloquism; ventriloquist; polyphonism^†, polyphonist^†.    [Science of voice] phonology etc. (sound) 402.    ... show more