I'm posting you the sentence again. I added a few other sentences. Thank you.

1)My child is outgoing, generous and likes teasing his classmates (I need an adjective: playful, annoying?). However, he is also stubborn, naughty and moody. Further, he gets sulky when I scold him (tell him off).
2)My wife is caring, thoughtful and sensible. She never loses her temper or gets angry. She is a careerist. On the other hand, I’m very temperamental and touchy.
3) She isn't at all shy. Can you say: "She isn't shy at all".
She is a but/quite/rather/very/really shy.
4)What does this sentence mean: "When's your friend in his/her element?
(Real question).
5) Who is your boyfriend? The one with (or in?) the red jacket?

1) reprimand = scold

3) yes
But not "but" = bit?

4) To be entirely at ease with your surroundings and the people in your company. One would be comfortable.

5) with a jacket = could be carrying it but in a jacket = must be wearing it.

Sra

1) For the first sentence, to describe the child's behavior, you could use the adjective "playful" to highlight the positive aspects of their outgoing and teasing nature. Alternatively, if you want to emphasize the negative aspects, you could use the adjective "annoying" to describe their behavior towards their classmates. It depends on the context and your intention.

2) The second sentence describes the wife as caring, thoughtful, sensible, and someone who doesn't lose her temper or get angry. On the other hand, it mentions that the speaker is temperamental and touchy. These adjectives convey opposite characteristics between the wife and the speaker.

3) The sentence "She isn't at all shy" is grammatically correct and conveys that the person in question lacks shyness completely. However, for the second part of the sentence, it would be more appropriate to use "a little" instead of "but/quite/ rather/very/really." For example, "She is a little shy" would indicate a mild level of shyness.

4) The sentence "When's your friend in his/her element?" means when is your friend most comfortable or at their best. This phrase is used to describe a situation where someone excels or feels most confident and natural.

5) In the sentence "Who is your boyfriend? The one with (or in?) the red jacket?", both "with" and "in" can be used interchangeably depending on the context. You can say "the one with the red jacket" or "the one in the red jacket" to refer to the boyfriend. They both mean the same and indicate that the boyfriend is wearing a red jacket.