adjective. Not announced beforehand.

adjective. Not acknowledged or acclaimed.

adjective. Without prior warning; unexpected or unannounced

adjective. Not heralded

adjective. without warning or announcement

"* "All politics is local": The old Tip O'Neill adage took a beating for the third straight House election cycle, as a national wave swept out good campaigners and swept in unheralded and underfunded candidates."

unexpected  

heralded  

unacknowledged  unannounced  unanticipated  unappreciated  unasked  

extraordinary  improbable  more than expected  out-of-the-way  past expectation