"unforeseen" in the adjective sense
1. unanticipated, unforeseen, unseen, unlooked-for, out of the blue
not anticipated
"unanticipated and disconcerting lines of development"- H.W.Glidden
"unforeseen circumstances"
"a virtue unlooked-for in people so full of energy"
"like a bolt out of the blue"
"unseen problems"
Source: WordNet® (An amazing lexical database of English)
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