This is the 9714th most frequent French word.
enfoncée
"Enfoncée" means "sunken" or "embedded."
In this sentence, 'enfoncée' is used in the context of describing the physical location of an object, with 'the key' being deeply embedded into 'the lock'.
La clé était enfoncée profondément dans la serrure.
The key was embedded deeply in the lock.
Here, 'enfoncée' highlights the position of a person, particularly the way they are seated deeply into 'her armchair' in a relaxed manner.
Elle était enfoncée dans son fauteuil, se détendant après une longue journée.
She was sunk into her armchair, relaxing after a long day.
'Enfoncée' is used to convey the result of a powerful action, describing how 'the window' was forcefully pushed in due to the storm.