Related Clues:

• How deadpan jokes are delivered
• Crack the whip at, perhaps
• Far from feral
• In a sardonic way
• Not apt to bite
• Break, so to speak
• Like petting-zoo animals
• Kind of dull
• In a dull way
• Gentle, as a horse
• Not risque at all
• Broken-in
• Broken, say
• Like pets
• Not exactly thrilling