I hadn't
I hadn't seen her.
Je ne l'avais pas vu depuis longtemps.
I hadn't seen him in a long time.
Si je ne l'avais pas retrouvé, j'aurais passé la journée à ressasser.
If I hadn’t found it again, I would have spent the day dwelling on it.
— Aquarius (2016)
Je ne l'avais pas remarqué jusqu'à ce que tu le dises.
I hadn't noticed it until you pointed it out.
Je ne l'avais pas remarqué jusqu'à ce que vous le disiez.
I hadn't noticed it until you mentioned it.
I hadn't hated it.
I didn't believe it.
I hadn't seen it.