forgetful /fɚˈgɛtfəl/ adjective Learner's definition of FORGETFUL
[more forgetful; most forgetful]
1
: tending to forget things : forgetting things often or easily健忘的;好忘事的 2
—
used to say that someone has forgotten something忘记的;疏忽的
— forgetfulness
noun [noncount]