1. Characterized by hard work and perseverance
   - hardworking, industrious, tireless

See also: diligent

• ultima
• ultima Thule
• ultimacy
• ultimate
• ultimate frisbee
• ultimately
• ultimateness
• ultimatum
• ultimo
• ultimogeniture
• ultra
• ultra vires
• ultra-high
• Ultracef
• ultracentrifugation
• ultracentrifuge
• ultraconservative
• ultrahigh frequency
• ultraism
• ultramarine
• ultramarine blue
• ultramicroscope
• ultramicroscopic
• ultramodern
• ultramontane