1. Without knowledge or intention
   - unwittingly, inadvertently

Antonym: knowingly

• ice-cream cake
• ice-cream cone
• ice-cream float
• ice-cream soda
• ice-cream sundae
• ice-free
• ice-hockey player
• ice-hockey rink
• ice-skater
• ice-skating rink
• ice-wagon
• iceberg
• iceberg lettuce
• iceboat
• icebound
• icebox
• icebox cake
• icebreaker
• icecap
• icecream
• iced coffee
• iced tea
• iced-tea spoon
• icefall
• icehouse