1. In jest
   "I asked him jokingly whether he thought he could drive the Calcutta-Peshawar express"
   - jestingly 
2. Not seriously
   - facetiously, tongue-in-cheek

See also: joking

Encyclopedia: Jokingly

• startup
• starvation
• starvation acidosis
• starve
• starved
• starved aster
• starveling
• starving
• starwort
• stash
• stash away
• stash house
• stasis
• Stassano furnace
• stat
• stat mi
• statal
• statant
• state
• state attorney
• state bank
• state boundary
• state capital
• state capitalism
• state change