| Barnes' Notes on the Bible Literally, "The crown of our head is fallen," i. e. what was our chief ornament and dignity is lost; the independence of the nation, and all that gave them rank and honor.
Clarke's Commentary on the BibleThe crown is fallen from our head - At feasts, marriages, etc., they used to crown themselves with garlands of flowers; all festivity of this kind was now at an end. Or it may refer to their having lost all sovereignty, being made slaves.
Gill's Exposition of the Entire BibleThe crown is fallen from our head,.... Or, "the crown of our head is fallen" (a); all their honour and glory as a nation were gone; the glory of their kingdom and priesthood, to both which a crown or mitre belonged; the glory of church and state. Aben Ezra interprets it of the temple, the place of the divine Majesty. Sanctius thinks there is an allusion to the crowns they wore upon their heads at their feasts and festivals; and so the words have a close connection with what goes before: woe unto us that we have sinned! which had brought all these evils upon them: this is not to be considered as an imprecation or denunciation of misery; but as a commiseration of their case; calling upon others to it, and particularly God himself, to have mercy upon them; for, alas for them! they had sinned, and justly deserved what was come upon them; and therefore throw themselves at the feet of mercy, and implore divine compassion. (a) "cecidit corona capitis nostri", V. L. Pagninus, Montanus, Calvin, Junius & Tremellius, Piscator.
Geneva Study BibleThe crown is fallen from our head: woe unto us, that we have sinned!
Wesley's Notes 5:16 The crown - All our honour, splendor and dignity.
King James Translators' NotesThe...: Heb. The crown of our head is fallen
Jamieson-Fausset-Brown Bible Commentary16. The crown-all our glory, the kingdom and the priesthood (Job 19:9; Ps 89:39, 44).
Matthew Henry's Concise Commentary5:1-16 Is any afflicted? Let him pray; and let him in prayer pour out his complaint to God. The people of God do so here; they complain not of evils feared, but of evils felt. If penitent and patient under what we suffer for the sins of our fathers, we may expect that He who punishes, will return in mercy to us. They acknowledge, Woe unto us that we have sinned! All our woes are owing to our own sin and folly. Though our sins and God's just displeasure cause our sufferings, we may hope in his pardoning mercy, his sanctifying grace, and his kind providence. But the sins of a man's whole life will be punished with vengeance at last, unless he obtains an interest in Him who bare our sins in his own body on the tree. | 
