1. Not knowledgeable about something specified
   "a person unacquainted with our customs"
   - innocent 
2. Having little or no knowledge of
   "unacquainted with city ways"
   - unacquainted with, unfamiliar with

See also: unfamiliar, uninformed

• body blow
• body count
• body covering
• body English
• body fluid
• body forth
• Charophyceae
• charr
• charred pancake cup
• Charronia
• Charronia flavigula
• chart
• charta
• chartaceous
• charter
• charter bus
• charter member
• charter school
• chartered
• chartered accountant
• charterer
• charterhouse
• Chartism
• chartist
• chartless