forgettable
adj. 易被忘记的，不值得记住的
例句
He has acted in three forgettable action films.
他已出演了三个反响不大的动作片。
《柯林斯英汉双解大词典》
It sounds like a commercial: easy on the ear but bland and forgettable.
它听起来像句广告语：顺耳却平淡易忘。
Math skills are also easily forgettable for kids during the two months of school break.
在两个月的学校假期里，孩子们也容易忘记数学技能。
