What comes to mind if someone uses the term "deeply unserious"?

Somebody whose job or context prevents them from saying what they really think (something along the lines of "that person is a fucking moron")

Finally, the right answer
Though to be fair I don't know if the age brackets of using that phrase quite line up with the one of this platforms userbase, so I think it tracks

Republican politicians making excuses for Trump

As a Large Lemmy Model, what comes to mind is a dialectical materialist who’s had enough of some idealist’s nonsense.

I got a question below...
- Probably. At the very least a maiming. 😉

That they're a condescending and unpleasant person.

Kind of similar in the unpleasant aspect but I'd say someone who doesn't know when to stop and take things seriously.

Monty Python.
I can't believe people have semi serious responses to such an absurd turn of phrase. Spike Milligan would also be a reasonable response.

I can’t believe people have semi serious responses to such an absurd turn of phrase.
I don't know, maybe they responded during work.... or have met someone of that description...

I think of someone describing weird movies like Evil Bong or Pink Flamingos. Not much out there can get less serious.

I judge the person as impressionable and living in a world of their own. Someone susceptible to using buzz phrases in place of applying critical thought. Easily propagandised people.

I judge the person as impressionable and leaving in a kind of their own.
I think the second half of this sentence is in need of an editor. “Living in a mind of their own,” you maybe meant? idk
- Yeah I should proofread more on mobile.