This is the 3679th most frequent Turkish word.
vazgeçilmez
Indispensable; essential; cannot be given up.
Here, 'vazgeçilmez' is used to indicate that books are essential and cannot be left out when considering learning.
Kitaplar öğrenmede vazgeçilmezdir.
Books are indispensable for learning.
In this sentence, 'vazgeçilmez' describes the importance and irreplaceable nature of friendship for the person in question.
Arkadaşlık onun için vazgeçilmez bir değerdir.
Friendship is an indispensable value for them.
This usage of 'vazgeçilmez' emphasizes the critical necessity of clear communication in professional contexts.