Antonyms of adj fab

1 sense of fab

Sense 1
fabulous, fab -- (extremely pleasing; "a fabulous vacation")

INDIRECT (VIA pleasing) -> displeasing -- (causing displeasure or lacking pleasing qualities)

Similarity of adj fab

1 sense of fab

Sense 1
fabulous, fab -- (extremely pleasing; "a fabulous vacation")
       => pleasing (vs. displeasing) -- (giving pleasure and satisfaction; "a pleasing piece of news"; "pleasing in manner and appearance")