frat(ə)nŋ/ adj whichcauses fear  a frightening sound of footstepsin the corridor  He had a frighteningthought – what if no one heard his cries forhelp? Synonym terrifying. Antonymsoothing

hear (NOTE: overheard /əυvəh" d/)

When he heard the sound of the bell his legs

One who can give a firsthand account of something seen, heard, or experienced, One who is called on to be present at a transaction in order to attest to what takes place, Attestation to a fact, statement, or event; testimony, intransitive verb_ To see or know by personal experience, To consider as an example. Often used in the imperative, To testify to one's religious beliefs, transitive verb_ To see or know by personal presence; to have direct cognizance of, To give testimony to; to testify to; to attest, (Law) To see the execution of, as an instrument, and subscribe it for the purpose of establishing its authenticity