This is the 13882nd most frequent German word.
fehlenden
"Missing" or "lacking."
'fehlenden' is used as an attributive adjective describing 'Seiten' in the case where they are missing.
Die fehlenden Seiten des Buches machen den Text schwierig zu verstehen.
The missing pages of the book make the text difficult to understand.
'fehlenden' describes the students who were absent or missing during class.
Der Lehrer bemerkte die fehlenden Schüler heute Morgen.
The teacher noticed the absent students this morning.
'fehlenden' modifies 'Informationen', indicating insufficiency or a lack of necessary data.