Jejune used in a sentence

Jejune in a sentence as an adjective

Dart is jejune, knee-jerk, and conservative in its design, from what I have now seen.

How is that a justification for making HN more jejune?

Of the former quotation, I at first thought, "How terrifically jejune.

This is the problem I saw in American high school when I moved to US: shallow introduction to mathematical topics made them vapid and jejune.

There will probably always be a snarky, jejune dismissal in every JavaScript thread, but commenters should think to themselves, “It doesn't have to be me.”

Unfortunately, that isn't a sentence: "jejune" is an adjective, not a noun; "belie" is a verb, not a noun; "inculcate" takes an indirect object with "in", not a direct object.

Offtopic, but a pet peeve: simplistic doesn't mean "having the qualities of, or relating to, being simple" as many people seem to think, it means something much more negative: "treating complex issues and problems as if they were much simpler than they really are" with the synonyms "facile, superficial, oversimple, oversimplified; shallow, jejune, naive.