Antonyms of adj high-class

1 sense of high-class

Sense 1
high-class, high-toned -- (pretentiously elegant; "a high-toned restaurant")

INDIRECT (VIA elegant) -> inelegant -- (lacking in refinement or grace or good taste)

Similarity of adj high-class

1 sense of high-class

Sense 1
high-class, high-toned -- (pretentiously elegant; "a high-toned restaurant")
       => elegant (vs. inelegant) -- (refined and tasteful in appearance or behavior or style; "elegant handwriting"; "an elegant dark suit"; "she was elegant to her fingertips"; "small churches with elegant white spires"; "an elegant mathematical solution--simple and precise and lucid")