Where does “slackadaisical” come from?

slackadaisical (English) comes from English lackadaisical, from English lackadaisy, from English alack, from Middle English alacke, from English ah, from Chinese 阿, from English aren’t, from English -n’t — not.

slackadaisical (English): Slipshod and lazy; lacking diligence and effort

Definitions

  1. Slipshod and lazy; lacking diligence and effort

Ancestry of “slackadaisical”, step by step

slackadaisical traces back through two separate lines of ancestry.

via English lackadaisical

StepLanguageWordMeaning
1EnglishlackadaisicalShowing no interest, vigor, determination, or...
2Englishlackadaisylackadaisical; lackaday
3EnglishalackAn expression of sorrow or mourning
4Middle Englishalacke
5EnglishahAn expression of relief, relaxation, comfort,...
6Chinese
7Englisharen’tare not (negative auxiliary)
8English-n’t
9EnglishNot
10Middle Englishnotnot; nothing, nought; nobody, no person
11Middle Englishnoughtnothing, none; not; iniquitous, wicked
12Old Englishnōwiht
13Old Englishnenot; or, and not; "ne... ne..." is used to mean "...
14Proto-West Germanic*ne
15Proto-Germanicnot

via English slack

StepLanguageWordMeaning
1EnglishslackThe part of anything that hangs loose, having no...
2Middle Englishslak
3Old Englishslæclazy
4Proto-Germanicslakazslack, lax
5Proto-Indo-European(s)leh₁g-weak, feeble; weak, faint
Every word from Proto-Germanic
slackadaisical — Etymology, Origin & Word History | Etymology Explorer