One proposed explanation says that a word cannot be baligh because balagha consists in matching the demands of the situation, which a word by itself cannot do. The author cautions that this argument is not adequate as a general reason.
وَالتَّعْلِيلُ بِأَنَّ الْبَلَاغَةَ إِنَّمَا هِيَ بِاعْتِبَارِ الْمُطَابَقَةِ لِمُقْتَضَى الْحَالِ وَهِيَ لَا تَتَحَقَّقُ فِي الْمُفْرَدِ وَهْمٌ
The argument that balagha depends only on situational conformity, which is not found in an isolated word, is a mistaken generalization.
The problem is taking a condition relevant to a particular kind of balagha and treating it as a sufficient explanation for every use of the term. The concepts of baligh discourse and a baligh speaker must also be distinguished.