Englishunadorned
adjective
they preferred sparse and unadorned church interiors:
unembellished, unornamented, undecorated, unelaborate, unvarnished, unfurnished, unpatterned, uncluttered, unostentatious, unfussy, no-nonsense, without frills, plain, penny plain, simple, basic, modest, restrained, straightforward;
bare, bald, austere, stark, severe, spartan, ascetic, clinical, clean;
informal no-frills.
▷antonyms ornate, fancy.