lackaday

lack·a·day

L0008500 (lăk′ə-dā′)interj. Archaic Used to express regret or disapproval.
[Alteration of alack the day.]

lackaday

(ˈlækəˌdeɪ) interjarchaic another word for alas[C17: from alack the day]

lack•a•day

(ˈlæk əˌdeɪ)

interj. Archaic. (used as an expression of regret, sorrow, or disapproval) [1685–95; alter. of alack the day]