This is the 4681st most frequent Polish word.
najsilniejszy
"Najsilniejszy" means "the strongest" in English.
In this sentence, 'najsilniejszy' is used as a superlative adjective describing the noun 'Piotr' to indicate he holds the highest degree of strength among individuals in the specified group.
Piotr jest najsilniejszy w całej drużynie.
Peter is the strongest in the entire team.
Here, 'najsilniejszy' is applied to 'wiatr' (wind), serving as a superlative adjective that compares the strength of the wind contextually to other days within a time frame.
Tego dnia wiatr był najsilniejszy od początku tygodnia.
That day the wind was the strongest since the beginning of the week.
In this usage, 'najsilniejszy' qualifying 'argumentów' to express that one specific argument had a greater impact or persuasiveness when compared to others.