This is the 740th most frequent Italian word.
piena
"Full" or "flood" (depending on context).
'Piena' describes the state of being full, indicating that the room has a high number of people in it.
La stanza è piena di persone.
The room is full of people.
'Piena' is used in a figurative sense here, expressing that the feeling is abundant with the quality of hope.
Ho una sensazione piena di speranza.
I have a feeling full of hope.
'Piena' denotes the physical state of water completely occupying the space in the bottle.