assiduously russian

• уси́ленно

  strenuously, intensely, vigorously, assiduously, hard

• приле́жно

  diligently, industriously, assiduously, studiously

• стара́тельно

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

• неосла́бно

  unremittingly, assiduously