Are there any languages without adpositions?

Inspired by Did Proto-Indo-European use prepositions, postpositions, or both? I want know:

Are there any living or well-documented dead languages (no reconstructions nor conlangs) that go without any adpositions?

The WALS sample has 30 languages without adpositions:

https://wals.info/chapter/85

The unsatisfying answer is that it will depend on how you define "adpositions". For example, Sumerian grammars generally use the term "case markers" instead, but these are clitics that attach to noun phrases instead of individual words, so they're as much adpositions as the Japanese ones.

Meanwhile, Swahili grammars often use the term "prepositions" for relational nouns, but these are syntactically nouns, with their own grammatical genders, and attach to other nouns with the normal genitive construction: paka iko ndani ya sanduku, idiomatically "the cat is in the box", is literally "cat located.at interior of box". You could call the ya here a preposition, but if so, it would be a category with only one member—so it would be a language with adposition, singular, not adpositions!

So the best answer I can give is, all languages have some way of turning a noun into some sort of adverbial modifier, but that way doesn't always have its own syntactic category. Whether that way is called "adpositions" or something else comes down to the author of the grammar, and doesn't necessarily correlate with whether it has its own syntactic category or not.