assiduous russian

• стара́тельный

  diligent, assiduous, painstaking

  industrious

• трудолюби́вый

  hard-working, industrious, diligent, assiduous

• и́стовый

  earnest, assiduous, fervent, zealous

• приле́жно

  diligently, industriously, assiduously, studiously

• стара́тельно

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

• неосла́бно

  unremittingly, assiduously

• неосла́бный

  unremitting, assiduous, unabated

• уси́дчивый

  assiduous, diligent