彼の返事はあやふやで、本当に行くのかわからない。
His reply was vague, so I don't know if he's really going.
あの日の記憶はあやふやだ。
My memory of that day is hazy.
He only gave a vague, non-committal reply.
You won't be trusted if you keep that wishy-washy attitude.
As time passes, memories become vague.
He ended the discussion having left the question of responsibility deliberately vague.