Complex
Complex adjective - Having many parts or aspects that are usually interrelated.
Unpredictable and complex are semantically related. In some cases you can use "Unpredictable" instead an adjective "Complex".
Unpredictable
Unpredictable adjective - Likely to change frequently, suddenly, or unexpectedly.
Complex and unpredictable are semantically related. Sometimes you can use "Complex" instead an adjective "Unpredictable".
Nearby Word: unpredictability
Both words in one sentence
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Chapters was even more complex and focused less on brutality and more on unpredictable, constantly shifting arrangements.
Source: Music / Defeated Sanity -
They're famed and feared for their unpredictable bounding gait and voracious ferocity, but Squigs form a surprisingly complex part of the greenskin ecosystem, serving as guard dogs, garbage disposals, livestock, and in one extremely specialized sub-species' case, hair plugs.
Source: Armless Biped - This index is also not for occurrences that are merely rare, but only due to wildly complex human factors that involve the net results of the unpredictable actions of multiple people (economics, elections, popularity, sports, strategy, etc.).
Source: This Index Is Highly Improbable
Cite this Source
Unpredictable and Complex. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/complex/unpredictable
Complex & Unpredictable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/complex/unpredictable>.
Unpredictable or Complex. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/complex/unpredictable.
Google Ngram Viewer shows how "complex" and "unpredictable" have occurred on timeline