hardworking (adj.)

• ardent
• assiduous
• diligent
• drudging
• energetic
• fervent
• hard
• indefatigable
• industrious
• laboring
• laborious
• plodding
• relentless
• sedulous
• sleepless
• straining
• strenuous
• struggling
• tireless
• toiling
• unflagging
• unremitting
• unsleeping
• unsparing
• unwearied
• vehement
• working
• zealous