unanticipated
UK: ˌʌnænˈtɪsɪpeɪtɪd | US: ˌʌnænˈtɪsɪpeɪtɪd
adj. not expected or predicted
adj. occurring without warning
The word "unanticipated" combines the negative prefix "un-" (from Old English "un-," meaning "not") with "anticipate" (from Latin "anticipare," meaning "to take beforehand," derived from "ante-" [before] + "capere" [to take]). The suffix "-ed" turns the verb into an adjective, forming a term that literally means "not expected beforehand." The logical progression reflects the negation of a prepared or foreseen event.
The sudden storm caused unanticipated delays in our travel plans.
Her unanticipated resignation left the team in shock.
The project faced unanticipated challenges due to budget cuts.
His unanticipated kindness made her day brighter.
Scientists discovered an unanticipated side effect of the new drug.