Nouns (0)

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Verbs (0)

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Adverbs (0)

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Adjectives (3)

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"

Fuzzynyms (0)

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Synonyms (5)

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

Antonyms (3)

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"

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