Keil & Delitzsch, on Lam 2:15

“Samech. All they that passed by the way have clapped their hands at thee: they have hissed, and wagged their heads at the daughter of Jerusalem, saying: Is this the city of perfect beauty, the joy of all the earth?”

“Strangers and enemies have, for the misfortune of Jerusalem, only expressions of scorn and delight over her loss. "Those who pass by the way" are strangers who travel past Jerusalem. To clap the hands together is not here a gesture betokening anger and disinclination (Num 24:10), but of delight over the injury of others, as in Job 27:23. שׂרק, to hiss, is an expression of scorn; see on Jer 19:8. The same is true as regards the shaking of the head; cf. Psa 22:8; Psa 109:25, etc.: the expression for this, in Jer 18:16, is הניד בּראשׁ. The exclamation, "Is this the city which they call 'perfect in beauty'?" is an expression of scornful astonishment. כּלילת יפי is substantially the same as מכלל יפי, Psa 50:2, where the expression is applied to Zion; in Eze 27:3 the same is said of Tyre. That Jeremiah had Psa 50:2 in his mind is shown by the apposition, "a joy of the whole earth," which is taken from Psa 48:3.”

Imported from an open dataset — not yet checked against the printed edition.