وَعَلَىٰ أَبْصَارِهِمْ غِشَاوَةٌ
And over their eyes is a covering. (al-Baqarah 2:7)
“غِشَاوَةٌ” is indefinite, allowing attention to a kind or quality of covering rather than a previously identified object. This illustrates how indefiniteness can draw attention to kind or manner.
فَأْذَنُوا بِحَرْبٍ مِنَ اللَّهِ وَرَسُولِهِ
Then be warned of war from Allah and His Messenger. (al-Baqarah 2:279)
In its context, the indefinite “حَرْبٍ” conveys gravity and fearful consequence. Elsewhere an indefinite may belittle. Neither glorification nor diminution is automatic: interpretation follows the actual occasion and wider meaning.