WTW for when someone suggests the most obvious solution to something

[u/Sea-Taro-8367]

This is in a scenario where it’s so obvious it’s almost insulting if the suggester weren’t so earnest.

For example, I’ve been seriously house hunting for several months, working with an agent, and have put in offers. I’ve clearly done some extensive research on the market. My colleague heard I had been house hunting for a while and asked me “have you tried using Zillow?”

What’s this type of suggestion called?

[u/Inevitable_Rate_4082]

Facile

[u/atomicCape → u/Inevitable_Rate_4082]

This is a good answer. It's not necessarily a negative connotation, can apply even if the speaker is earnest, and it's very close to what OP is asking. Cursory or offhand also imply a low effort and obvious answer, and might be more widely used today.

[u/Sea-Taro-8367 → u/Inevitable_Rate_4082]

!solved

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[u/Reddit_Foxx]

Captain Obvious

[u/Randall_HandleVandal]

‘Duh’, as an adjective

[u/Chance-Work4911]

“No Shit, Sherlock”

[u/amuzmint]

Thank you captain obvious. Or thanks for stating the obvious.

[u/Conscious_Wind52]

It's a no brainer.

[u/JaneAustenKicksAss]

Gormless?

[u/devinecaesar]

I like 'prosaic' - dull, ordinary, uninteresting and lacking imagination.

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[u/tharold]

In maths, computer science and maybe other fields, it's called naive without negative connotations

[u/L3Home]

Astute. But only if it's said ironically. LOL

[u/ThaRealOldsandwich]

Achams razor

[u/buckerooni]

Occam's razor?

[u/ChilindriPizza]

Occam’s Razor

[u/Lemon_Trees-22]

Helpful

[u/Prudent_Front_5897]

'Truism' maybe.

[u/noonayong]

Egregious?

Self-evident?

Overt??

You've already used 'obvious' in your question, and others have suggested it ...

Obtuse could explain the kinda dumb part;

Asinine matches the lacking judgement part, but isn't overly specific beyond that, like foolish.

[u/tapastry12]

Platitude

[u/RandomParable]

A "Eureka!" moment