butt-ugly

Adjective

colloquial derogatory idiomatic not-comparable

(idiomatic, colloquial, derogatory) Extremely ugly.

Japanese Meaning

極端に醜い / とんでもなく醜い / 非常に醜い

Even after the restoration, the antique vase looked butt-ugly next to the elegant porcelains.

修復後でも、骨董の花瓶は上品な磁器の隣ではものすごく醜く見えた。

Sense（1）

(idiomatic, colloquial, derogatory) Extremely ugly.