形容词形式:forgetful、forgettable例如：
1、I'm getting forgetful in my old age.我上了年纪，变得健忘了。
2、My mother has become very forgetful and confused recently.我妈妈近来变得非常健忘，糊里糊涂。
3、He was average height， average build， with mousy hair and a forgettable face.他中等身高、中等身材、灰褐色头发，长着一张过目即忘的脸。
