Ad lib
Ad lib adverb - Without advance preparation.
Suppositious and ad lib are semantically related. In some cases you can use "Suppositious" instead an adjective phrase "Ad lib".
Suppositious
Suppositious adjective - Based primarily on surmise rather than adequate evidence.
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Synonyms for Suppositious
Ad lib and suppositious are semantically related. Sometimes you can use "Ad lib" instead an adjective "Suppositious".
Mutual synonyms
Cite this Source
Suppositious and Ad lib. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/ad_lib/suppositious
Ad lib & Suppositious. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/ad_lib/suppositious>.
Suppositious or Ad lib. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/ad_lib/suppositious.
Google Ngram Viewer shows how "ad lib" and "suppositious" have occurred on timeline