Someone who is sophisticated is comfortable in social situations and knows
about culture, fashion, and other matters that are considered socially important. = refined
A sophisticated person is intelligent and knows a lot, so that they are able
to understand complicated situations.
Caution is great care which you take in order to avoid possible danger.
Extreme caution should be exercised when buying part-worn tyres...
The Chancellor is a man of caution.
If you call someone a coward, you disapprove of them because they are easily frightened
and avoid dangerous or difficult situations. She accused her husband of being a coward.
Something that is tranquil is calm and peaceful.
The tranquil atmosphere of The Connaught allows guests to feel totally at home... = serene
Luxury is very great comfort, especially among beautiful and expensive surroundings.
By all accounts he leads a life of considerable luxury...
She was brought up in an atmosphere of luxury and wealth. = extravagance
A luxury is something expensive which is not necessary but which gives you pleasure.
A week by the sea is a luxury they can no longer afford...
Telephones are still a luxury in some parts of Spain, Portugal, and Greece. = extravagance
If someone behaves or moves with dignity, they are calm, controlled, and admirable.