Other constituents can show different values of indefiniteness. The source draws on Qur'anic examples that highlight the difference between grave magnitude and weak estimation:
فَأْذَنُوا بِحَرْبٍ مِنَ اللَّهِ وَرَسُولِهِ
Then be informed of war from Allah and His Messenger. (Al-Baqarah 2:279)
The indefiniteness of «حَرْبٍ» can emphasize the terrifying gravity of the threatened war. Compare:
إِنْ نَظُنُّ إِلَّا ظَنًّا
We are only making a conjecture. (Al-Jāthiyah 45:32)
Here «ظَنًّا» can convey the frailty or uncertainty of the conjecture. Both expressions are indefinite, but their rhetorical effects differ.