Not looked for; not expected or foreseen
Occurring without warning; unforeseen.
in a way that was not expected
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: unprepared for, unlooked-for, unforeseen, surprising, unanticipated, not predicted, unexpected, unplanned and unexpectedly.