1. not worth remembering; easily forgotten

Examples

• The movie was so unmemorable that I forgot the plot within hours.
• His speech was unmemorable and failed to inspire the audience.
• The restaurant served unmemorable food at high prices.
• After years of unmemorable performances, the actor finally got a breakthrough role.
• The hotel room was clean but completely unmemorable.
• She gave an unmemorable presentation that put half the class to sleep.