From Longman Dictionary of Contemporary Englishknow no boundsknow no boundsformalLIMIT if someone’s honesty, kindness etc knows no bounds, they are extremely honest etc → bound
Examples from the Corpus
know no bounds• Only in later centuries, when Constant Drachenfels' daring knew no bounds, did the famed, fabled horrors begin.• Sarah's pride in her daughter knew no bounds.• His business enterprise knew no bounds.• As the men filed into Faneuil Hall, in solid columns, the enthusiasm knew no bounds...• And as you know, greed knows no bounds.• Paul's love for her knew no bounds.• Faith in benign science knew no bounds.• It was once again proved that the credulity of trainees knew no bounds.know no boundsknow no boundsformal if a feeling or quality knows no bounds, it is not limited in any way His enthusiasm knew no bounds. → knowExamples from the Corpus
know no bounds• And as you know, greed knows no bounds.• As the men filed into Faneuil Hall, in solid columns, the enthusiasm knew no bounds...• Faith in benign science knew no bounds.• His business enterprise knew no bounds.• It was once again proved that the credulity of trainees knew no bounds.• Sarah's pride in her daughter knew no bounds.• Only in later centuries, when Constant Drachenfels' daring knew no bounds, did the famed, fabled horrors begin. 