studious russian

• приле́жно

  diligently, industriously, assiduously, studiously

• стара́тельно

  diligently, with application, with assiduity, studiously, assiduously, zealously

Examples

• В нашем кла́ссе нет ма́льчика прилежнее, чем Джек.No other boy in our class is more studious than Jack.