1. In an arduous manner
   "they worked arduously"
   - toilsomely, gruellingly [Brit, Cdn], gruelingly [US]

See also: arduous

• underemployment
• underestimate
• underestimation
• underevaluation
• underexpose
• underexposure
• underfed
• underfeed
• underfelt
• underfoot
• underframe
• underfur
• undergarment
• undergird
• underglaze
• undergo
• undergrad
• undergraduate
• underground
• underground press
• Underground Railroad
• Underground Railway
• undergrow
• undergrowth
• underhand