72797
> あいつ にしちゃ 思い切った な。

I had a hard time to translate this short sentence. And after I looked around
from many sources, I found these clues.

> 思い切った
>
> 普通では考えられないような。おどろくほど大胆な。 「 －処置を取る」

source: <https://www.weblio.jp/>

にしては (= ni shitewa)

(casual contraction) にしちゃ (= ni shicha)

source: Grammar Lesson from Maggie Sensei's site

> あいつ にしちゃ 思い切った な。

My translation:

> It's surprisingly bold for (that guy / he / she).

Did I translate the sentence properly, yet?
CC BY-SA 4.0
2019-09-27T14:31:59.320
72142
2019-10-29T01:18:11.657
2020-06-17T08:18:27.500
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35087
question
translation nuances compound-verbs
The translation for 思い切った
I think your translation is close. But we can describe it in detail. From your
comment,

`The sentence was from a short novel, about the intrigue between schoolmates
to get rid of each other. In short, the person mentioned in the sentence took
the risk. I was just a bit confused since the word can also be translated as
"losing one's mind"`

From their judgement, You might be guessing the outcome could be going towards
wrong direction and you might feel as if one is `losing his/her mind`. But the
expression 「思い切った」focuses on " **distinct and unexpected** " decision by
him/her rather than his/her behavior. Now, I have applied it to the situation
you described.

So, the schoolmates secretly having scheme in order not to be annoyed by the
opponent. Probably one dobs the opponent in about his/her pranks to the
teacher who teaches the subject which the opponent is not good at in order
that the opponent is called on at class and being humiliated by not answering
the teacher's question.

But this time, the one having been dobbed in as usual is retaliating
immediately to the rival regardless of considering the chance of getting
further revenge from the rival.

From other people observing, the one doing so was unexpected. So they are
commenting like「あいつ にしちゃ 思い切った な。」: **_"It is bold/daring and unhesitant for
him/her to do so."_**
CC BY-SA 4.0
2019-09-28T07:40:36.680
72160
2019-09-28T07:40:36.680
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72142
answer
> 「あいつ にしちゃ 思{おも}い切{き}った な。」

Without any context -- without even another word or any explanation of the
context -- native speakers will know **two things** for certain from this
short sentence.

**1) This dude （あいつ） made a big decision and executed it**.

We know that because 「思い切る」 as a verb means " **to get up the nerve to do
something drastic/unusual** ".

The fact that you, for some reason, looked up the meaning of 「思い切った」 as an
**adjectival phrase** ended up affecting your translation attempt because that
forced you to deal with a verb-less sentence.

**2) The dude is not the kind of person who is known to take such (drastic)
actions**.

We know this from the 「あいつ **にしちゃ** 」 part, which means " **considering the
kind of person that he is** ". 「にしちゃ」 (colloquial form of 「にしては」) has that
type of built-in emphasizing factor.

My own TL:

> "For/Considering the kind of person that he is, he has done something very
> drastic."
CC BY-SA 4.0
2019-10-28T16:00:56.037
72797
2019-10-29T00:45:46.483
2019-10-29T00:45:46.483
72142
answer