This is the 13553rd most frequent Polish word.
pilny
"Pilny" in English means "diligent" or "urgent," depending on context.
Here, 'pilny' is used to describe someone who is diligent, thorough, and industrious in behavior.
Jestem pilnym uczniem.
I am a diligent student.
In this context, 'pilny' conveys the sense of urgency referring to the matter discussed.
To jest pilna sprawa.
This is an urgent matter.
Here, 'pilne' (the neuter gender form of 'pilny') is used to underline the urgent nature of the summons received.