This is the 15801st most frequent Polish word.
słabiej
"Weaker" or "less strongly."
In this sentence, 'słabiej' describes the gradual decrease in proficiency of speaking English, serving as a comparative adverb indicating reduced ability.
Mówisz coraz słabiej po angielsku.
You speak English increasingly weaker.
Here, 'słabiej' is used to compare the visibility condition after the storm to a better state before it, emphasizing the degradation.
Po burzy widoczność stała się słabiej.
After the storm, visibility became weaker.
In this usage, 'słabiej' expresses a comparative relationship regarding the effectiveness of the internet as the physical distance from the city increases.