If you say that things are higgledy-piggledy, you mean that they are very disorganized and untidy.
Books are often stacked in higgledy-piggledy piles on the floor.
Higgledy-piggledy is also an adverb., adv ADV after v
A whole valley of boulders tossed higgledy-piggledy as though by some giant.
Translation English Cobuild Collins Dictionary
adv all over the place, all over the shop (informal) anyhow, any old how, confusedly, disorderly, haphazard, helter-skelter, pell-mell, topsy-turvy
adj haphazard, helter-skelter, indiscriminate, jumbled, muddled, pell-mell, topsy-turvy
English Collins Dictionary - English synonyms & Thesaurus
Add your entry in the Collaborative Dictionary.