1. Exhibiting methodical and systematic characteristics that would be useful in business 
2. Not distracted by anything unrelated to the goal
   - earnest

See also: efficient, purposeful

• cliff rose
• cliff swallow
• cliff-brake
• cliff-hanging
• cliffhanger
• Clifford Odets
• Clifford trust
• Cliftonia
• Cliftonia monophylla
• climacteric
• climactic
• climate
• climate change
• climatic
• climatic zone
• climatical
• climatically
• climatological
• climatologist
• climatology
• climax
• climb
• climb on
• climb up
• climb-down