This is the 806th most frequent Slovak word.
plne
Fully
In this context, 'plne' is used as an adverb to mean fully, describing the extent to which the room is lit.
Táto miestnosť je plne osvetlená.
This room is fully lit.
In this sentence, 'plne' conveys the total extent of readiness, used as an adverb.
Bol plne pripravený na skúšku.
He was completely prepared for the exam.
Here, 'plne' functions as an adverb emphasizing the entirety of being convincing, signifying a strong degree.