1. Impossible to forget

See also: haunting, memorable, persistent, red-letter, unforgettably

Antonym: forgettable

Encyclopedia: Unforgettable

• idempotent
• identical
• identical twin
• identically
• identicalness
• identifiable
• identifiably
• identification
• identification number
• identification particle
• identified
• identifier
• identify
• Identikit
• Identikit picture
• identity
• identity card
• identity crisis
• identity element
• identity matrix
• identity operator
• identity theft
• identity verification
• ideogram
• ideograph