unfacetious
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unfacetious — adjective Not facetious; serious, sincere … Wiktionary
unfacetious — adj.; unfacetiously, adv.; unfacetiousness, n. * * * unfaˈcetious, a. (un 1 7.) [see inficete a.] … Useful english dictionary
unfacetiously — adverb In an unfacetious way … Wiktionary