What's a good adjective to describe someone who doesn't react when someone does something immature or insults them?
closed as too broad by Mazura, Mehper C. Palavuzlar, Kristina Lopez, tchrist♦, Hellion Oct 15 '15 at 17:04
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How about stoic?
1 capitalized : of, relating to, or resembling the Stoics or their doctrines
2 : not affected by or showing passion or feeling; especially: firmly restraining response to pain or distress
To remain impassive (or impassible)
Definition: revealing no emotion; expressionless, giving no sign of feeling.
Example: she remained impassive as the officers informed her of her son's death
There are many terms that spring to mind, but the first for me was thick-skinned.
I think the word you need is phlegmatic.
The OED lists etymology, and multiple senses - nounal and adjectival. Perhaps the one most relevant to the question is adjectival sense 2.
- Having, showing, or characteristic of the temperament formerly believed to result from a predominance of phlegm among the bodily humours; not easily excited to feeling or action; stolidly calm, self-possessed, imperturbable; (with pejorative connotation) sluggish, apathetic, lacking enthusiasm.
The various senses have examples from as early as the 14th century. But here are just three recent ones from sense 2.
1888 F. Hume Madame Midas i. iv. 33 Selina resumed her knitting in a most phlegmatic manner.
1915 W. S. Maugham Of Human Bondage xxx. 130 No sign of astonishment appeared on Emil's phlegmatic face.
1991 Sunday Mail Mag. (Brisbane) 1 Dec. 12/2 She has the robust air of a true countrywoman, phlegmatic, pragmatic, aware that sooner or later, nature, or life, will kick you in the teeth.
How about Unaffected or Unperturbed?
/bläˈzā/ adjective unimpressed or indifferent to something because one has experienced or seen it so often before.
Example: He was blasé about being down voted.
You could be indifferent; just don't care.
In such a generic situation as that, I would just say mature.
She was perfectly mature in the face of her younger brother's taunting. She didn't even bat an eye.
More casually, grown up.
Could this person be a perfect personification, of pluterperfect imperturbability? So in a word, imperturbable.
Of course, that answer assumes you wish to describe a person who maintains a regular expression in the face of adversity. So my reply presumes the response is part of a pattern matching the expected behaviour of your character. If, however, your narrative has this reaction as an isolated incident, then the suggestion of Shark Trager, may be more appropriate in this case.
North American informal (of a person) not disconcerted; unperturbed.
They're like Teflon
Or it [the insult] is like
water off a duck's back
If you don't react when you should, then you are 'numb' or 'dead' or a 'potato'.
If you're good at controlling yourself in a good way, then you are 'stoic'.
If you self-control like a robot, or get no feelings to control, then you are 'stone-faced', 'affectless', or a 'robot'.
And so many other adjectives ...
In the case of an immature act or insult, I suggest - confident.
A person with confidence knows they are above the insult or immature act and will not allow it to steer them off course.
You could say they have a "stone-cold" poker face.