This is the 5461st most frequent Russian word.
плотные
Dense, thick, or solid.
Here, "плотные" describes the physical compactness and solidity of the walls.
Стены в этом доме очень плотные.
The walls in this house are very dense.
In this sentence, "плотные" refers to schedules that are full and tightly packed with activities.
У него плотные графики работы.
He has tight work schedules.
"Плотные" in this context describes the soups as being thick and satisfying.