Part of speech:
Occurring without warning; unforeseen.
Not looked for; not expected or foreseen
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: not predicted, surprising, unanticipated, unexpected, unforeseen, unplanned, unprepared for, unlooked-for and unexpectedly.