Inane

Non sequitur is the last resort of the inane.

It was completely inane.

I can't stand such number of inane trivialities.

Wise men told him his simple fancies were inane and childish, and he believed it because he could see that they might easily be so.

This supremely gifted kid told me that in the early elementary grades, the songs sung in music class were so inane that he wanted to skip grades already! Eventually he did, so better late than never.

Francesca followed, reluctant enough in her secret; for though she would not have admitted it even to herself, she did shrink from the infliction of the inane solemnities with which her father garnished his discourse—to say nothing of the ungracious reflections which so often glanced at herself.

God, if she had to listen to another conversation about some kid she didnʼt know—how Tina J. stole the stage at the talent show or Bobby R. won the tee ball game or any other number of inane accomplishments.

Vague and inane instincts.

The undistinguishable inane of infinite space.

[...] whom we watch as we watch the clouds careering in the windy, bottomless inane, or read about like characters in ancient and rather fabulous annals.