unforeseen
UK: ˌʌnfɔːˈsiːn | US: ˌʌnfɔːrˈsiːn
adj. not anticipated or predicted
adj. happening unexpectedly
"Unforeseen" combines negation ("un-") with the concept of prior perception ("fore" + "seen"). The word emerged in Middle English (14th century) to describe events that could not be "seen beforehand," reflecting a logical progression from literal vision to metaphorical anticipation. The structure preserves Old English roots while forming a transparent compound.
The project faced delays due to unforeseen circumstances.
His sudden resignation was completely unforeseen by the team.
The contract includes clauses for unforeseen expenses.
Unforeseen weather conditions forced the event's cancellation.
She handled the unforeseen challenge with remarkable composure.