Casually and Seriously

Opposite meaning words

Casually adverb - In an unconcerned manner.

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Seriously is an antonym for casually.

Nearby Words: casual, casualty

Seriously adverb - To a great degree.

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Casually is an antonym for seriously in topics: dangerously, not humorously.

Nearby Words: serious, seriousness

Because seriously, could you imagine the REAL Luigi casually running through all those dangerous levels?

Source: WMG / Super Mario Bros.
An example that illustrates just how seriously this is taken occurs in A Civil Campaign, when Gregor is would-be-casually talking to Lord Dono and party.

Source: I Gave My Word
Even when he casually blasts apart and overrides her plans three times in two episodes, she still can't take him or his power seriously.

Source: Parental Obliviousness

Cite this Source

Seriously and Casually. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/casually/seriously

Casually & Seriously. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/casually/seriously>.

Seriously or Casually. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/casually/seriously.

Google Ngram Viewer shows how "casually" and "seriously" have occurred on timeline