This is the 12183rd most frequent Spanish word.
inventada
Inventada: Invented or made up.
Here, 'inventada' describes something fabricated or not real, specifically a story.
Esa historia está inventada.
That story is made-up.
In this sentence, 'inventada' is used to indicate that the excuse seems artificial or contrived.
La excusa que dio parecía inventada.
The excuse he gave seemed fabricated.
This usage of 'inventada' emphasizes the creative and original construction of a solution, not something fabricated.