Zephaniah 1:15 says the great Day of the LORD will be a day of what?

Answer: Wrath

"That day will be a day of wrath, a day of trouble and distress... a day of darkness and gloom."

“The great Day of the LORD is near—near and coming quickly. Listen, the Day of the LORD! Then the cry of the mighty will be bitter. That day will be a day of wrath, a day of trouble and distress, a day of destruction and desolation, a day of darkness and gloom, a day of clouds and blackness,”— Zephaniah 1:14-15 (BSB)