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How do we know when "どんどん" includes a notion of speed?

> ある種の動物は **どんどん** 数が減ってきている。  
>  Certain animals are fast disappearing.

Here it's something(continuous and) fast.

> 霧が **どんどん** 濃くなっている。  
>  The fog is growing thicker.

Here it just tells that it's something growing in a regular manner but the
speed is normal.

How can we conclude which meaning is the good one? Sometimes the context could
not be sufficient because of the nature of this difference.
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2018-04-08T21:20:26.893
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2018-04-09T01:33:50.110
2018-04-08T21:30:12.433
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question
meaning
How do we know when "どんどん" includes a notion of speed?
> ある種{しゅ}の動物{どうぶつ}はどんどん数{かず}が減{へ}ってきている。 Certain animals are **fast**
> disappearing.
>
> 霧{きり}がどんどん濃{こ}くなっている。 The fog is growing thicker.

In both sentences, 「どんどん」 means the exact same thing, which is " **
_increasingly_** ", " ** _progressively_** ", etc.

Someone (or is it you?) happened to use the word " ** _fast_** " in
translating the first sentence, but that does not mean that the first sentence
focuses more on speed than the second.

"Speed" may be implied by 「どんどん」 in the sense that it is often used to
describe the changes that are taking place more rapidly than one might expect.
Unless expressed by other words in the context, however, 「どんどん」, all by
itself, does not particularly include a strong notion of speed.
CC BY-SA 3.0
2018-04-09T00:07:14.743
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2018-04-09T01:33:50.110
2018-04-09T01:33:50.110
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answer