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infrasonic
adj. having frequencies below those of audible sound
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subsonic
adj. (of speed) less than that of sound in a designated medium; "aircraft flying at subsonic speeds"
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voiceless, breathed
adj. uttered without voice; "could hardly hear her breathed plea, `Help me'"; "voiceless whispers"
silent
adj. having a frequency below or above the range of human audibility; "a silent dog whistle"
ultrasonic, supersonic
adj. having frequencies above those of audible sound
unheard
adj. not necessarily inaudible but not heard
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infrasonic
Parts Of Speech
  • Nouns
    0
  • Verbs
    0
  • Adverbs
    0
  • Adjectives
    1
Relationships
  • Fuzzynyms
    1
  • Synonyms
    6
  • Antonyms
    0