Antonyms of adj out_of_the_blue

1 sense of out of the blue

Sense 1
unanticipated, unforeseen, unlooked-for, out of the blue (predicate) -- (not anticipated; "unanticipated and disconcerting lines of development"- H.W.Glidden; "unforeseen circumstances"; "a virtue unlooked-for in people so full of energy"; "like a bolt out of the blue")

INDIRECT (VIA unexpected) -> expected -- (considered likely or probable to happen or arrive; "prepared for the expected attack")

Similarity of adj out_of_the_blue

1 sense of out of the blue

Sense 1
unanticipated, unforeseen, unlooked-for, out of the blue (predicate) -- (not anticipated; "unanticipated and disconcerting lines of development"- H.W.Glidden; "unforeseen circumstances"; "a virtue unlooked-for in people so full of energy"; "like a bolt out of the blue")
       => unexpected (vs. expected) -- (not expected or anticipated; "unexpected guests"; "unexpected news")

Synonyms of adv out_of_the_blue

1 sense of out of the blue

Sense 1
unexpectedly, out of the blue -- (in a way that was not expected; "her brother showed up at the wedding out of the blue")