1. An exclamation expressing sorrow, regret, or disappointment.
Usage: archaic; literary; variant of 'alack' or 'alas'

Examples

• Lackaday, I have lost my way in the forest.
• Lackaday, the ship has sailed without us.
• Lackaday, what shall we do now?
• Lackaday, those were happier times.
• Lackaday, I fear we are too late.