forgettable
adj. B2 Upper Intermediate US //fɝˈɡɛtəbəɫ// UK //fəɡˈɛtəbəl// for·get·table
adj. easy to forget. You use this to describe something that does not leave a strong impression on you.
adj. easily forgotten or not likely to be remembered. Often used to describe people, events, or experiences that lack distinctive qualities.
The movie was so forgettable that I don't remember the plot.
The party was a forgettable event because the music was too loud and the food was terrible.
While the lead actor's performance was stellar, the supporting cast was largely forgettable, failing to leave a lasting impression on the audience.
From forget + -able.