Not looked for; not expected or foreseen
in a way that was not expected
Occurring without warning; unforeseen.
Find another word for out-of-the-blue. In this page you can discover 9 synonyms, antonyms, idiomatic expressions, and related words for out-of-the-blue, like: unforeseen, unplanned, unprepared for, unlooked-for, not predicted, unexpectedly, unanticipated, surprising and unexpected.