/ Dictionary / Index L lackaday: Meaning and Definition of Find definitions for: lack•a•day Pronunciation: (lak'u-dā"), [key] — interj. Archaic. (used as an expression of regret, sorrow, dismay, or disapproval.) Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lackadaisical Lackawanna Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language