Antonyms of adj expectable

1 sense of expectable

Sense 1
expectable -- (to be expected; "differences of opinion are quite expectable given the present information")

INDIRECT (VIA expected) -> unexpected -- (not expected or anticipated; "unexpected guests"; "unexpected news")

Similarity of adj expectable

1 sense of expectable

Sense 1
expectable -- (to be expected; "differences of opinion are quite expectable given the present information")
       => expected (vs. unexpected) -- (considered likely or probable to happen or arrive; "prepared for the expected attack")