Adjective : a serious occasion; a serious man. ,His interest was serious. ,serious reading; a serious task. ,a serious book; Marriage is a serious matter. ,The plan has one serious flaw.    From Dictionary.com. 

Noun : You have to learn to separate the serious from the frivolous.    From Dictionary.com. 

Like a dreary overblown, overserious, super-depressing needless remake of a TV show most people had forgotten about.    From Wordnik.com.  [Colin Farrell Gets His Stalky Restraining Order] Reference

The Aussie management style, which tends to be open, egalitarian and not overserious, also plays well with the troops.    From Wordnik.com.  [Up Top, From Down Under] Reference

But she had a radiant smile—not so common among overserious Iranian politicians—and a Nokia mobile phone cord clipped beneath her chin, for constant calling.    From Wordnik.com.  [Let the Swords Encircle Me] Reference

Arrogant, proud, overserious, and sometimes a bit greedy or obsessed with whatever treasure you choose to pursue ... you have enchanted people for centuries, and will continue to do so.    From Wordnik.com.  [amjl81 Diary Entry] Reference

He was gone before I could tell him that the man he had pointed out, Eddie Alfanta, was a regular at the bar, always came with his wife, Cheryl, whom he adored, and was a well-known accountant downtown -- overserious but successful, with an office on Bishop Street.    From Wordnik.com.  [Beard] Reference

On the other, it is symptomatic of the overserious intent of a formidable budding splatter artist.    From Wordnik.com.  [UGO.com - Latest Stories] Reference

Reid's den in the Tribune Building he reappeared, strangely changed - no longer the rosy-cheeked, buoyant boy - an overserious, prematurely old man.    From Wordnik.com.  ["Marse Henry" : an autobiography,] Reference

Reid's den in the Tribune Building he reappeared, strangely changed -- no longer the rosy-cheeked, buoyant boy -- an overserious, prematurely old man.    From Wordnik.com.  [Marse Henry, Complete An Autobiography] Reference

Blacksn0w, child of overserious shadow-lurker GeoHot and brother of equally straighforward jailbreak app Blackra1n, is now available, and should make unlocking your late-version iPhone.    From Wordnik.com.  [Megite Technology News: What's Happening Right Now] Reference

Because of this, and her overserious attitudes generally, girls of her own age rather avoided her, and she became painfully self-conscious in their company as well as in the company of men.    From Wordnik.com.  [The Foundations of Personality] Reference

(Note to all overserious Obama supporters: the Duval reference was intended as a joke.    From Wordnik.com.  [Polls: Obama Holds Small Edge In Wisconsin] Reference

Amputate those gangrenous old sections that aren’t worth having around (lame, overserious superhero comics, mostly, although I would think that’s really just a little toe).    From Wordnik.com.  [November « 2008 « The Manga Curmudgeon] Reference