This is the 4995th most frequent Japanese word.
絶える
"絶える" means "to cease," "to end," or "to disappear."
The phrase '絶えることを知らない' is an expression indicating enduring persistence without ending.
絶えることを知らない挑戦への意気込み。
The determination towards challenges that knows no end.
Here, 絶える is used in the form '絶えることなく' which means 'without ceasing,' indicating the continuation without stopping.
その家に住む人々の笑い声が絶えることなく続いた。
The laughter of the people living in the house continued without ceasing.
In this sentence, 絶える is used to indicate the sudden cessation or interruption of the communication.