Your entire post is utter nonsense.

1: Yes it is my job to teach the definition. It is also my job to teach fluency, which means appropriate use of words. Although we know definitions are not your strong suite, so I understand this is a difficult concept for you.

2: Of course they have different linguistic registers. That was my very point! Do you actually know what any of these terms mean or are you (as I suspect) furiously googling as you go along in the hope the people reading will be blinded by the terminology?! Linguistic registers are used to show degrees of formality with use of a language, so the choice of the word 'ugly' is available should your intent be to be insulting, or the polite use of 'unattractive' should you not wish to offend. Which was my very point. Do keep up.

It is nothing to do with manipulation and everything to do with my role as a language teacher.

When you teach adjectives of appearance you teach what is considered by a native speaker (of which you are not so I understand your confusion) to be polite and what is considered rude. So you teach 'fat' and the polite 'overweight', you teach 'skinny' and the polite 'thin', and so on. The student then has the option of forming polite observations to describe somebody physically or they have the option to be rude. The same is true for adjectives of personality. And again for extreme adjectives (for example using 'furious' instead of simply 'angry').

You do not understand this as, for all your pontificating, you are neither a native speaker nor (thankfully) an ESL teacher and so I understand the concept of actually teaching the English language fluently and responsibly to students is something you just have no actual experience of.

3: The ages I teach are between 5 and 65 years of age. I specialise in YL teaching, but have said repeatedly that I also teach adults up to C2 proficiency. A fact you are apparently selectively blind to. Learning is acquired in stages, we do not live in the matrix and cannot simply download a language directly to our brain... So no, I wouldn't teach 'unattractive' to my low level classes of any age. It would begin with basic adjectives and as they progress through the CEFR it would be built upon and their vocabulary expanded. I used the words 'ugly' and 'unattractive' simply as an example of when learning about English culture is appropriate within an ESL lesson. You appear to have taken that to mean I teach it to 7 year old beginner speakers, but again that probably comes from the fact you don't actually know what real ESL teaching is.

And what they would use in their native language is not the issue. I am not teaching them to translate word for word how they speak in their native language, I am teaching them to speak English. Whether they would use that word in Spanish (or whatever nationality they are) is not the point, that it is used in English is. Teaching a student how to translate what they want to say in English from their native tongue is not a question of teaching direct word for word translation, it is about teaching them the nuances and differences in the use of language. This is the difference between fluency and owning a dictionary. Again, you cannot hope to understand as you are not actually an ESL teacher.

And no, a dog lying bleeding in the street would look distressed. Only a heartless b@stard would look at a wounded, suffering animal and have the adjective 'ugly' spring to mind. That or somebody who doesn't really understand definitions very well, of course...