1. In an undertone
   "he uttered a curse sotto voce"
   - in a low voice

Encyclopedia: Sotto voce

• igniter
• ignitible
• ignition
• ignition coil
• ignition interlock
• ignition key
• ignition lock
• ignition switch
• ignition system
• ignitor
• ignobility
• ignoble
• ignobleness
• ignobly
• ignominious
• ignominiously
• ignominiousness
• ignominy
• ignoramus
• ignorance
• ignorant
• ignorantly
• ignorantness
• ignoratio elenchi
• ignore