This is the 15270th most frequent Polish word.
sił
"Sił" is the genitive plural form of "siła," meaning "strength" or "force."
In this sentence, 'sił' denotes physical or mental strength or energy necessary to accomplish an activity.
Nie mam wystarczająco sił na dokończenie tego zadania.
I don't have enough strength to complete this task.
Here, 'sił' (in plural form as 'siły') refers to the combined power or efforts of groups or individuals working together.
Wojska zbrojne połączyły swoje siły, aby bronić kraju.
The armed forces joined their forces to defend the country.
This sentence applies 'sił' in the context of personal exertion or use of energy towards a goal or action.