not easily forgottenan unforgettable evening of dining and dancing
an unforgettable evening of dining and dancing
indelible, memorable
notable, noteworthy, remarkable
forgettable
unremarkable
in 1806
英语同义词词典收录了63618条英语词条，基本涵盖了全部常用同义词或反义词的辨析及翻译，是英语学习的有利工具。