This is the 17889th most frequent Polish word.
łagodny
Gentle, mild, or calm.
Here "łagodny" is used to describe the temperament of the dog, emphasizing its gentle and non-aggressive nature.
Ten pies jest bardzo łagodny i nigdy nie gryzie.
This dog is very gentle and never bites.
In this sentence, "łagodny" refers to the severity of an illness being mild or not serious.
Chory miał łagodny przebieg choroby, więc szybko wrócił do zdrowia.
The patient had a mild course of the disease, so they recovered quickly.
Here "łagodnym" is used as an adjective to describe the quality of her voice being soft and soothing.