1. Without knowledge or intention
   - unwittingly, inadvertently

Antonym: knowingly

• water softener
• water spaniel
• water speedwell
• water spirit
• water sport
• water sprite
• water star grass
• water starwort
• water stoma
• water strider
• water supply
• water system
• water table
• water tank
• water tap
• water thrush
• water tower
• water travel
• water trumpet
• water turkey
• water under the bridge
• water vapor
• water vapour
• water vascular system
• water violet