Frivolent

frivol + -ent. frivol is a back-formation from frivolous.

Full definition of frivolent

"This was an unnecessary and frivolent post that did not contain any reason or logic." — http://groups-beta.google.com/group/rec.games.computer.ultima.series/msg/4dd74e0205254b64
"You're beginning to annoy me with frivolent and useless theoretical arguments. " — http://groups-beta.google.com/group/comp.sys.ibm.pc.hardware.chips/msg/e4d760b0a4bf5722
"I'm sorry but I have personally seen so many people paid out on fraudulent and frivolent claims to have any faith in the system as it currently stands. " — http://groups-beta.google.com/group/uk.legal.moderated/msg/551e5debdc0715f1
"My serious replies tend to evoke 'I couldn't worship that sort of a God' responses. My frivolent replies are usually intended to show that some of the criticisms aimed at my serious replies aren't as well-founded as the person making them seems to think." — http://groups-beta.google.com/group/uk.religion.christian/msg/4110e62d55ad2c2b