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As the title above, why do japanese locals remove theいfrom the いadjective when
speaking. For example, I have heard words like 早、やば、高 being used when
speaking. Is this only used amongst friends (very casual), or can it also be
used in formal situations?

I know that removing the い from the adjective and appending a さ turns the
adjective into a noun. But if さ is not appended, will it stay as a verb,
rather then bring turned into a noun?
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2019-07-30T03:48:08.017
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2019-07-30T09:04:53.943
2019-07-30T09:04:53.943
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question
spoken-language i-adjectives contractions
Saying い adjectives without pronouncing the い
It's uttered as a colloquial, casual and **exclamatory** phrase. It's
typically used in response to a situation/stimulation that strikes you
suddenly. `っ` is often added after the stem.

>   * 高っ! (Wow,) it's expensive!
>   * やば(っ)! (Wow,) this is bad!
>   * 痛っ! Ouch!
>   * きもちわる(っ)! Gross!
>

In formal settings, you should generally avoid this, but no one would blame
you for saying 痛っ or 熱っ if you are really suffering.

Related: [In real life, do Japanese speakers exclaim things like 熱っ！ or 痛たた…
or 寒！?](https://japanese.stackexchange.com/q/21418/5010)

Not all i-adjectives work like this. We rarely say 悲しっ or 寂しっ, presumably
because these are not "sudden" stimulation. Most adjectives used like this are
negative ones, but there are exceptions (うまっ, 安っ, ...).
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2019-07-30T07:06:55.810
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2019-07-30T07:11:59.187
2019-07-30T07:11:59.187
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answer