うすうす
thinly; slightly; vaguely; a little
Also written 薄薄
Adverb
彼かれに会あったのを薄々うすうす覚おぼえている。
I vaguely remember meeting him.
私わたしが本当ほんとうの母親ははおやではないことを娘むすめは薄々うすうす感かんずいているようだ。
It seems as if my daughter is faintly aware that I'm not her real mother.