Possible Clues:

• Add this to multiply a number by ten - dead easy!
• Listlessness
• Slowness to move or act
• Subject of Mach's principle
• Languor
• Repairing train that is remaining motionless?
• Way of selling art that is in fashion
• One will have little to do with it., to tie in with the rain
• Slowness to take action, state of laziness
• Sluggishness - sloth