1. Not defended or capable of being defended
   - assailable, undefendable, open

See also: vulnerable

• importance
• important
• important person
• important-looking
• importantly
• importation
• imported
• importee
• importer
• importing
• importunate
• importunately
• importune
• importunity
• imposable
• impose
• imposed
• imposer
• imposing
• imposingly
• imposition
• impossibility
• impossible
• impossible action
• impossibleness