This is the 9706th most frequent French word.
encombrées
"Encombrées" means "cluttered" or "blocked."
In this sentence, 'encombrées' is used as an adjective to describe the streets as being congested or filled with a crowd.
Les rues étaient encombrées par la foule.
The streets were crowded with people.
Here, 'encombrées' qualifies the tables, indicating they are overloaded with various objects causing clutter.
Les tables étaient encombrées de papiers et de livres.
The tables were cluttered with papers and books.
In this example, 'encombrées' (used in the form 'encombré' to agree with 'son esprit') metaphorically conveys a state of being overwhelmed or burdened mentally.