What would be the most elaborate constructed language today in terms of size of vocabulary, complexity of grammar, number of exceptions to the rules of the language, etc.? If we exclude Esperanto, of course, which I suspect would be the number one on the list.

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    Esperanto doesn't come close to being number one in terms of complexity of grammar. Ithkuil laughs at that assertion. Commented May 24, 2022 at 22:24
  • @KeithMorrison that is why size of vocabulary, number of exceptions, and, most importantly, "etc" are all there in the question.
    – Maksim
    Commented May 25, 2022 at 6:05
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    How can "etc" ever be the most important item on a list? If there are more important items than the ones you said, what POSSIBLE reason could there be to not list them first? Regardless, I'd say Ithkuil might not have many exceptions, but its grammar and phonology are incredibly complex, and its vocabulary still contains at least almost 1000 roots, producing 18000 stems of distinct meanings.
    – Cecilia
    Commented May 25, 2022 at 11:13
  • Size of vocabulary could be a discussion on its own and would be more objective. I don't see why Esperanto would be first in complexity of grammar or number of exceptions, and I have no idea what "etc." might include.
    – prosfilaes
    Commented May 25, 2022 at 14:49
  • I'm inclined to close this as opinion based - "most elaborate" really isn't an objective description.
    – curiousdannii
    Commented May 26, 2022 at 5:53

1 Answer 1


My personal guess would still be IALA Interlingua which has an established language community and some tradition. It came with a rather elaborate dictionary right from the start.

But there are some contenders, Klingon driven by fandom with an active language community, and Toki Pona.

I am not sure about the status of the various projects of zonal Slavic languages like Interslavic—tracking and distinguishing all the ongoing projects with vexingly similar names and frequent renamings or synonyms is already really difficult.

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    Isn't Toki Pona designed specifically to be simple and minimalistic, i.e. not elaborate? (Not to say that the construction of Toki Pona was not an elaborate task; Lang's work is certainly incredible)
    – Cecilia
    Commented May 25, 2022 at 11:17
  • Sometimes, simple rules can create very complex systems, in terms of games I think of Go/Baduk/Weiqi compared to Chess. Elaboration is than the amount of theory and practice available, both Go and Chess are highly elaborate games. Judging from the Q&A to Toki Pona here, it has reached some higher level of elaboration already.
    – Sir Cornflakes
    Commented May 25, 2022 at 12:39

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