The antithesis of frivolous

I've promised myself that I won't do anything frivolous until I'm done grading midterm exams, so now I have to rationalize blogging as a non-frivolous act, and then I'll have to rationalize my attempt to rationalize blogging, and then I'll have to rationalize my rationalization of my rationalization and so on ad infinitum. I'll never get done unless I get started, so here goes:

First, let us examine the source beloved by persons seeking to establish the seriousness of their endeavors: the Oxford English Dictionary. "Frivolous," asserts the OED, means "Of little or no weight, value, or importance; paltry, trumpery; not worthy of serious attention; having no reasonable ground or purpose."

Thus, in order to be non-frivolous, this blog post must be weighty, important, worthy of serious attention, purposeful, and whatever the opposite of "trumpery" might be. Untrumpful? Lacking in trumpitude? Further exploration reveals the following enlightening quotation under the entry for "trumpery":

"1456 Sir G. Haye Law Arms (S.T.S.) 287 For gif fulis...be sa daft that thai wage bataill for lytill, evyn as to say...that he dauncis or syngis better na he dois, or for syk maner of tromperyis."

This blog would not be so daft as to wage battle for lytill or to claim that it dauncis or syngis better na he dois; indeed, this blog rarely dauncis or syngis at all, which speaks highly of its untrumpitude.

But I digress. The OED also defines "frivolous" as "Characterized by lack of seriousness, sense, or reverence; given to trifling, silly." The OED is hardly a trifling tome--have you seen the size of that thing?--and no one would ever claim that it lacked seriousness, sense, or reverence, especially considering the worshipful responses it evokes from abecedarians and lexicographers everywhere. Since the OED itself is not characterized by frivolity, a blog post carrying the full heft of the OED can hardly be called lightweight. Q.E.D.

But wait: the OED encompasses the word "frivolous" and this blog post embraces the OED. How can I practice non-frivolity while immersing myself within the origins of the word? I find myself agreeing with a quotation the OED offers from Thomas Timme's Commentarie of Iohn Caluine upon Genesis, translated in 1578: "It is too frivolous and vaine to expound this worde." Trump that.