Unpredictable
Unpredictable adjective - Likely to change frequently, suddenly, or unexpectedly.
Vacuous and unpredictable are semantically related. In some cases you can use "Vacuous" instead an adjective "Unpredictable".
Nearby Word: unpredictability
Vacuous
Vacuous adjective - Lacking contents that could or should be present.
Unpredictable and vacuous are semantically related. Sometimes you can use "Unpredictable" instead an adjective "Vacuous".
Mutual synonyms
Cite this Source
Vacuous and Unpredictable. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/unpredictable/vacuous
Unpredictable & Vacuous. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/unpredictable/vacuous>.
Vacuous or Unpredictable. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/unpredictable/vacuous.
Google Ngram Viewer shows how "unpredictable" and "vacuous" have occurred on timeline