Of or pertaining to expression, either in language, genetics, the face or the arts

Expressionist.

Of, pertaining to, or in the style of expressionism

A painter who paints in this style

plural of expressionist

without expression

A movement in the arts in which the artist did not depict objective reality, but rather a subjective expression of their inner experiences / A somewhat analogous genre in early 20th century music

The state of being without an expression.

(art) An artist who works within the genre of Abstract Expressionism.

plural of expressionism