I know many highly analytic languages (Chinese, Vietnamese, Thai) are tonal languages. Are there similarly analytic or isolating languages that don't use tone the way those languages do? The closest I can find is Indonesian, but its verbs seem more synthetic than English, at least according to WALS.
The best example is probably Khmer. The difficulty is finding an isolating language at all, i.e. a language with absolutely no word-formation processes (where everything is syntax). In many linguistic theories, this is a spurious distinction (affixation is always syntactic). Today's no-affixing language was probably yesterday's lightly-affixing language, so in Khmer there are some sets of words of similar form and meaning that look like they have prefixes such as [ɗaəm] 'origin', [pʰɗaəm] 'to originate (trans.)', but these are not productive processes. There are compounds, but compounds are often treated as two words (not affixation) in typological theories that admit of a concept of "isolating". What is clear is that Khmer does not have tone. Another candidate is Kéo, said to be highly isolating, and not reported to have tone.
1I can confirm (having the grammar to hand) that Kéo is indeed highly isolating, having a single clitic, some reduplication (borrowed from Indonesian/Malay) and some compounding. And no tone. Mar 16, 2022 at 10:39
Yes, there are. You already mentioned WALS but you aren't aware of how to make use of it to answer the question: On the maps view you can combine the maps of different features. Here's a combined view of 26A "Prefixing vs. Suffixing in Inflectional Morphology" and 13A "Tone". The WALS sample contains 28 languages in the category "No tones / litte affixation":
Atayal Chamorro Canela Drehu Fijian Hawaiian Huastec Iaai Iban Koyra Chiini Khmer Kharia Khasi Makah Malagasy Maori Maranungku Rapanui Sedang Sanuma Taba Tagalog Tigak Tetun Ungarinjin Wari' Wolof Yapese
Of course, this sample needs to be reevaluated, but it is a good starter.
1Why is Malagasy on the list? On its verbs, Malagasy marks tense with prefixes, mood with shifting the stress and with suffixes. Also, Tagalog has developed verbal morphology. If Malagasy and Tagalog are on the list, why aren't there Malay at least in its Betawi a.k.a. Jakartan Malay variety? Mar 15, 2022 at 11:22
2@YellowSky: This I mean with of course, this sample needs to be reevaluated. For being not at the list: WALS just has a sample of languages, it does not pool all available language data. And judgements may differ. Mar 15, 2022 at 12:08
I was surprised to see Makah on the list; it's Wakashan and part of the NW Coast Sprachbund, which means it's polysynthetic. Not isolating at all. No tones, though. See en.wikipedia.org/wiki/Makah_language#Morphology– jlawlerMar 15, 2022 at 19:42