nonsensical

[ non-sen-si-kuh l ]

/ nɒnˈsɛn sɪ kəl /

(of words or language) having little or no meaning; making little or no sense: A baby's babbling is appealingly nonsensical.

(of behavior, conduct, actions, etc.) foolish, senseless, fatuous, or absurd: His nonsensical behavior was unusual for such a serious person.

objectionable, impudent, insubordinate: I refuse to listen to that nonsensical gossip.

of trifling importance or of little or no use: I've had more than enough of your nonsensical advice!

Origin of nonsensical

nonsense + -ical

non·sen·si·cal·ly, adverb non·sen·si·cal·i·ty, non·sen·si·cal·ness, noun

The method in question, they say, is not only unproven but nonsensical.

‘Hero’ Doc Accused of Harvesting Stem Cells in Dirty Basements |Barbie Latza Nadeau |April 29, 2014 |DAILY BEAST
The twenthysomethings in the audience cheered at all the nonsensical provocation.

I Was Way Too Old for Z100’s Jingle Ball Concert. But I Couldn’t Have Had More Fun. |Kevin Fallon |December 14, 2013 |DAILY BEAST
Mold them into fireworks, nonsensical swirls, and random color bursts.

Miley Cyrus, Walter White, Oprah: Your Pop Culture Halloween Costume Guide |Kevin Fallon |October 21, 2013 |DAILY BEAST
Or is the line just a collection of nonsensical sounds and syllables?

Miley Cyrus’s Craziest Lyrics From ‘Bangerz,’ Analyzed |Amy Zimmerman |October 8, 2013 |DAILY BEAST

But production values are a minor quibble when looking at a show as nonsensical and inane as this one.

‘Hemlock Grove’: Netflix’s Latest Original Show Is Scary Bad |Jace Lacob |April 19, 2013 |DAILY BEAST
He was very kind to me, and greatly enjoyed hearing some of my nonsensical dialect readings.

Old Times in Dixie Land |Caroline E. Merrick
And you'll want to make a lot of those pretty, useless, nonsensical things other girls make when they marry.

Prudence of the Parsonage |Ethel Hueston
"All that is nonsensical allegory," said Varvara Petrovna, getting angry at last.

The Possessed |Fyodor Dostoevsky
And my own brother, Belle, with his nonsensical Wagner worship, drove me to marry a man I had only met twice.

Melomaniacs |James Huneker
Now, don't be deceived by nonsensical talk about living beings in other planets.

The British Barbarians |Grant Allen