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inaudible - definition and synonyms

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adjective inaudible pronunciation in British English /ɪnˈɔːdəb(ə)l/
  1. difficult or impossible to hear
    He lowered his voice still further, until it was almost inaudible.

derived word

inaudibly

adverb
‘I can do it,’ she mumbled almost inaudibly.

nanodegree

a course of study which is much shorter than a university course and focuses on the skills you need for a job, especially computer-related skills

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hypocaust

an ancient Roman system of underfloor heating, used to heat houses with hot air; from the Latin 'hypocaustum'

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