I wonder what are the cases where adjectives are also used instead of adverbs. I know some adjectives are also adverbs, for example "slow", which is listed as both an adjective and an adverb. Others are used as adverbs in certain cases, for example "good" (Listen to me good). We all know that, and it can be found in dictionaries.

But sometimes I feel adjectives could be used as if they were adverbs, and no dictionary lists adjectives like "funny" as adverbs too. So... could someone tell me more about this?
Here are a few examples that doesn't sound completely unnatural to me:

You are acting weird.
They talk funny.
You should pronounce them different.

Thank you Emotion: smile
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The ones you list, and more like them, are widely used in casual conversation, but should (as I always say) be avoided in careful writing.
Oh, oh! An embarrassing slip by one of our stars on the Forum!

... a few examples that doesn't ...

Emotion: embarrassed

Emotion: smile
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When the contexts involve the senses, adjectives behave like adverbs.

She looks sensational / beautiful > completely fine.

This cake tastes very light > completely fine.

The band sounds terrible > not terribly. They may play terribly.

Her hands feel very silky > not silkily.

The hot cookies out of the oven smell so good!

Oops... lol, well, I make a lot of mistakes like that. Either because I don't really read what I've written, or because... because... I don't know why. It's just that I find myself writing "she don't know".
Well, this is off topic, but Christina Aguilera says "That don't..." for example. I know black people say "She don't", "That don't", but who else uses those structures among white people?

As for the main question in this thread, I understand those structures are used... it's just that I thought maybe someone could tell me more about that, like other common examples, or exceptions. But don't worry, it's not very impotant. If I ever need to know more about something specific, I'll post again.

And thank you. Emotion: smile

PS: I didn't see your post Goodman. Yes, your examples are ok, but those are actually adjectives, where the verbs are used as linking verbs, I think. Examples like your "She cooks good" are more like the ones I'm interested in.
<<<When the contexts involve the senses, adjectives behave like adverbs.>>>

Of course they are adjectives. That's my point. Song lyrics don't necessarily follow grammar rules. "She don't love you, like I love you..." is just the typical country lyrics to reflect the flavor of the country sounds. She cooks good or you need to listen good is not mainstream English....
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Just one more little tidbit for thought. The verb 'act' is sometimes used as a linking verb, so it's not unheard of to (correctly) use an adjective after that verb. The verbs Goodman mentioned are also 'linking verbs'. (If you don't already have a list of 'linking verbs', Kooyeen, you can find one pretty easily with Google.)
You know what? I'm starting to think this problem actually doesn't exist. Because there's nothing really strange, all the verbs I used are linking verbs or behave like linking verbs in some cases.

Act: act dumb.
Different: it's also an adverb.
Talk: talk bullisht, talk dirty...

And now take "behave". I don't think it behaves like a linking verb in any case, so I guess that's the reason why "They behave funny" doesn't sound good to me.

Emotion: smile
slow = verb
slowly = adverb
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