Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class IV. Words Relating to the Intellectual Faculties
Division (II) Communication of Ideas
Section III. Means of Communicating Ideas
2. Spoken Language

581. Aphonia.

   NOUN:APHONIA or aphony; dumbness &c. adj.; obmutescence [rare]; absence -, want- of voice; dysphonia or dysphony; silence (taciturnity) [See Taciturnity]; raucity; harsh voice [See Stridor], unmusical voice [See Discord]; quaver, quavering; falsetto, “childish treble”; deaf-mutism, deaf-muteness, deaf-dumbness, mute, dummy, deaf-mute.
   VERB:SPEAK LOW, speak softly; whisper (faintness) [See Faintness]; keep silence [See Taciturnity].
  SILENCE; render -mute, – silent; muzzle, muffle, suppress, smother, gag, strike dumb, dumfound or dumbfound, dumfounder or dumbfounder, mum [obs.], drown the voice, put to silence, stop one’s mouth, cut one short.
  stick in the throat.
   ADJECTIVE:APHONOUS, nonvocal, aphonic, dumb, mute, deaf and dumb, deafdumb; mum; obmutescent [rare], tonguetied; breathless, tongueless, voiceless, speechless, wordless; mute as a -fish, – stockfish, – mackerel; silent (taciturn) [See Taciturnity]; muzzled; inarticulate, inaudible.
  CROAKING, raucous, hoarse, husky, dry, hollow, sepulchral, hoarse as a raven; rough.
   ADVERB:WITH BATED BREATH, with the finger on the lips; sotto voce [It.]; in a -low tone, – cracked voice, – broken voice; in broken tones, aside, in an aside.
   INTERJECTION:MUM! hush! sh! silence! whist! whisht! [dial.]; chut! (silence) [See Silence].    QUOTATIONS:
  1. Vox faucibus hæsit.—Vergil
  2. There is a homely old adage which runs: ‘Speak softly and carry a big stick; you will go far’.—Roosevelt