In which theatre style is the acting often highly-stylized and gestural?

The theatre style that features highly stylized and gestural acting is expressionism. In expressionism, the performance often seeks to convey emotional experiences and internal states rather than simply depicting realistic scenarios. This results in an emphasis on exaggerated movements, abstract settings, and often a distortion of reality to express the characters' inner feelings and anxieties. The intention is to communicate through heightened physicality and symbolism, allowing the audience to connect with the emotional truths represented on stage, rather than merely reflecting the external world.

The other styles mentioned focus on different approaches to performance: naturalism aims for a lifelike representation of reality, realism seeks a truthful depiction of everyday life without the exaggeration found in expressionism, and classicism follows established conventions of Greek and Roman theatre, which often emphasize order, balance, and harmony. Each style has its own characteristics, with expressionism standing out for its bold and impactful use of gestural language.