This is the 4649th most frequent French word.
oubliée
Forgotten.
Here, 'oubliée' is in its past participle form and used as part of the verb 'oublier' in the passé composé.
Elle a oublié la clef hier soir.
She forgot the key last night.
In this sentence, 'oubliée' is used as an adjective describing the noun 'lettre', agreeing in gender and number.
La lettre oubliée sur le bureau contenait des informations importantes.
The forgotten letter on the desk contained important information.
Here, 'oubliée' functions as a past participle in a passive voice construction in a subjunctive clause.