Where does “unanticipated” come from?

Unanticipated is a formation of the English prefix un- (from Latin unus and ultimately Proto-Indo-European óynos meaning "one") combined with anticipated, expressing negation through the sense of singularity or unity.

unanticipated (English): Not anticipated

Definitions

Not anticipated

Ancestry of “unanticipated”, step by step

Step	Language	Word	Meaning
1	English	Un-	not
2	Middle English	un-	—
3	Old English	un-	negation or absence of: un-, non-; bad; forms...
4	Proto-West Germanic	un-	not, un-
5	Proto-Germanic	un-	not, un-
6	Proto-Indo-European	n̥-	not, un-
7	Proto-Indo-European	ne	not

Words derived from “unanticipated”

unanticipatedly

Every word from Proto-Indo-European ne →Every word from English Un- →Every word from Proto-Indo-European n̥- →