Complicated
Complicated adjective - Having many parts or aspects that are usually interrelated.
Lengthy and complicated are semantically related. In some cases you can use "Lengthy" instead an adjective "Complicated".
Lengthy
Lengthy adjective - Of great extent from end to end.
Complicated and lengthy are semantically related. Sometimes you can use "Complicated" instead an adjective "Lengthy".
Mutual synonyms
Both words in one sentence
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There was also a lengthy and complicated legal process they underwent offscreen to prove that Platt was really Northup, and Bass had to post several letters, not just one.
Source: Film / 12 Years a Slave -
For example, after the lengthy explanation of the old British system of currency, it quips how the Brits spent a long time avoiding decimal system "because they thought it was too complicated".
Source: Literature / Good Omens - Easy Levels, Hard Bosses: You can easily mow down hordes of minions, but the bosses are all lengthy, fairly complicated affairs that will likely cause most of your deaths.
Cite this Source
Lengthy and Complicated. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/complicated/lengthy
Complicated & Lengthy. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/complicated/lengthy>.
Lengthy or Complicated. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/complicated/lengthy.
Google Ngram Viewer shows how "complicated" and "lengthy" have occurred on timeline