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

See also: diligent

• felo-de-se
• felon
• felonious
• felonry
• felony
• felsite
• felspar
• felt
• felt fern
• felt fungus
• felt hat
• felt tip
• felt up
• felt-tip pen
• felt-tipped pen
• felted
• felucca
• felwort
• FEMA
• female
• female aristocrat
• female body
• female bonding
• female chest
• female child