Antonyms of adj preferable

1 sense of preferable

Sense 1
preferable, preferred -- (more desirable than another; "coffee is preferable to tea"; "Danny's preferred name is `Dan'")

INDIRECT (VIA desirable) -> undesirable, unwanted -- (not wanted; "undesirable impurities in steel"; "legislation excluding undesirable aliens";"removed the unwanted vegetation")

Similarity of adj preferable

1 sense of preferable

Sense 1
preferable, preferred -- (more desirable than another; "coffee is preferable to tea"; "Danny's preferred name is `Dan'")
       => desirable (vs. undesirable) -- (worth having or seeking or achieving; "a desirable job"; "computer with many desirable features"; "a desirable outcome")