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ultrasonic, supersonic
adj. having frequencies above those of audible sound
supersonic
adj. (of speed) greater than the speed of sound in a given medium (especially air); "a supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon"
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voiceless, breathed
adj. uttered without voice; "could hardly hear her breathed plea, `Help me'"; "voiceless whispers"
infrasonic
adj. having frequencies below those of audible sound
silent
adj. having a frequency below or above the range of human audibility; "a silent dog whistle"
unheard
adj. not necessarily inaudible but not heard
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transonic, sonic
adj. (of speed) having or caused by speed approximately equal to that of sound in air at sea level; "a sonic boom"
subsonic
adj. (of speed) less than that of sound in a designated medium; "aircraft flying at subsonic speeds"
supersonic
Parts Of Speech
  • Nouns
    0
  • Verbs
    0
  • Adverbs
    0
  • Adjectives
    3
Relationships
  • Fuzzynyms
    0
  • Synonyms
    5
  • Antonyms
    3